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<image>The diagram shows a schematic of the knee-jerk reflex. Which of the following statements is correct regarding the inhibitory interneuron of the quadriceps and the biceps femoris ( )
A. The diagram involves 4 neurons, of which 2 are motor (efferent) neurons
B. Inhibitory neurons do not release neurotransmitters, thus exerting an inhibitory effect on subsequent neurons
C. The contraction of the quadriceps inhibits the relaxation of the biceps femoris through the reflex arc
D. In an excited state, the potential across the nerve cell membrane is positive outside and negative inside
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A
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<image>Both individuals A and B exhibit low levels of thyroid hormones. The table below shows the concentration of thyroid-stimulating hormone (TSH) for each person 30 minutes before and after injecting an appropriate amount of thyrotropin-releasing hormone (TRH). Which of the following statements is correct? ( )
A. The target cells for TSH can be hypothalamic cells, thyroid cells, and muscle cells.
B. The increase in TSH concentration in individual A after TRH injection is a result of feedback regulation.
C. The location of the lesion in individual B is the pituitary gland.
D. The oxygen consumption of both individuals A and B before TRH injection is higher than that of normal individuals.
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C
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<image>The diagram represents the growth curve of a certain fish population in a pond. Based on the diagram, which statement is correct? ()
A. The most intense competition for resources and space within the species occurs in segment bc of the curve.
B. After $_{3}$, the only possible reason the population cannot continue to grow is a lack of food and space.
C. To maintain a high fish yield over the long term, the number of this fish species should be kept around point b on the curve after each catch.
D. The value is the maximum density that this population can reach in this environment.
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C
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<image>As shown in the diagram, a simplified food web of an ecosystem, the correct statement is ( ).
A. There are a total of 5 food chains in this ecosystem
B. The energy required for the life activities of organisms in this ecosystem ultimately comes from grass
C. As a component of a complete ecosystem, decomposers are missing in the diagram
D. The biological relationship between the eagle and the snake is both predation and competition
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D
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<image>Diagram A is a schematic diagram of a microscope structure. Diagrams B and C are observations of onion epidermal cells and human oral epithelial cells under a microscope, respectively. Which of the following statements is incorrect? ( ).
A. The only energy converter present in the cells in Diagram B is the mitochondria.
B. When adjusting 1. to lower the microscope tube, the eye must look at the objective lens from the side.
C. To observe more cells in the field of view, a 40× objective lens should be used.
D. When making a temporary mount for Diagram C, physiological saline is dropped in the center of the slide.
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C
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<image>Avery and colleagues conducted experiments using R-type and S-type pneumococcus, with the results shown in the table below. From the table, it can be concluded that ( )
A. 1. Cannot prove that the protein of S-type bacteria is not the transforming factor
B. 2. Indicates that the capsular polysaccharide of S-type bacteria has enzymatic activity
C. 3. and 4. indicate that the DNA of S-type bacteria is the transforming factor
D. 1.~4. indicate that DNA is the primary genetic material
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C
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<image>To test the regulatory effect of a certain preparation on the immune function of the body, healthy mice were fed with feed containing different doses of the preparation. After a period of time, the mice were injected with sheep red blood cells, and the content of hemolysin (an antibody against sheep red blood cells that can cause their lysis) in the mouse serum was measured, resulting in the following graph. Which of the following judgments is incorrect? ( )
A. The sheep red blood cells used in the experiment are equivalent to antigens.
B. Hemolysin is synthesized by plasma cells, and its secretion process depends on the fluidity of the cell membrane.
C. Hemolysin can cause the lysis of sheep red blood cells, and this process belongs to cellular immunity.
D. The medium dose of the preparation has the greatest enhancing effect on the immune function of mice.
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C
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<image>The diagram shows a pedigree of a certain genetic disease. Please calculate the probability of the children of individuals II<sub>2</sub> and II<sub>3</sub> having the disease ( )
A. 1/3
B. 2/3
C. 1
D. 1/2
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B
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<image>The diagram shows a schematic of the regulation of the body's internal environment homeostasis. Which of the following statements is correct? ( )
A. The oxidation and breakdown of pyruvate in the internal environment provides energy to cells, facilitating life activities.
B. In the diagram, 3. The nervous system directly controls the activity of endocrine glands.
C. Cannon proposed that the maintenance of homeostasis in the human internal environment is the result of neuro-humoral-immune regulation.
D. The main pathway for blood glucose regulation is 1.4.6.5.
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D
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<image>A certain plant has flowers that are purple, yellow, and white. The synthesis pathway of the pigments is shown in the diagram. Which of the following statements is incorrect? ( )
A. A plant with the genotype aabb has white flowers
B. A plant with the genotype aaBB has yellow flowers
C. A plant with the genotype Aabb has yellow flowers
D. A plant with the genotype AABb has purple flowers
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B
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<image>The diagram shows the process of ribosomes a, b, and c successively binding to an mRNA molecule and moving along the mRNA to synthesize a polypeptide chain. Which of the following statements is incorrect? ( )
A. The ribosome that first binds to the mRNA is a
B. The ribosomes move in the direction of arrow 1
C. Water is produced in the process shown
D. The base pairing in the process shown is A-U, G-C
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A
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<image>Which of the following statements about the two cell division images is correct? ( )
A. Both 1 and 2 are cells in the process of egg cell formation
B. Both 1 and 2 contain two pairs of homologous chromosomes
C. 1 can produce $$4$$ types of gametes
D. 2 can produce $$1$$ type of gamete
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D
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<image>As shown in the figure, a, b, and c represent modern engineering technologies, and 1, 2, and 3 represent their results. Based on the figure, which of the following statements is correct? ( )
A. If a is nuclear transfer technology, 1 reflects that animal cells also have totipotency.
B. If b is in vitro fertilization technology, then designing test-tube babies using this technology has certain ethical controversies.
C. If c is embryo splitting technology, the individuals in 3 must have the same genotype and phenotype.
D. The receptors in 2 and 3 need to be injected with gonadotropins to achieve superovulation.
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B
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<image>The diagram shows the process of transmission and expression of genetic information in the nuclear genes of a eukaryotic cell. Which of the following statements is correct? ( )
A. The base pairing situation is the same in process 2.
B. Process 3 occurs in the same location.
C. The enzymes required for process 2 are the same.
D. The direction of ribosome movement in the process is from left to right.
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D
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<image>The journal 'Science' reported that researchers have developed a new method to induce human pluripotent stem cells (also known as iPS cells) without foreign and potentially harmful DNA. The diagram below is a schematic of the experiment applying this technique to human cells. Which of the following statements is correct? ( )
A. Processes 1, 2, and 3 demonstrate the totipotency of iPS cells.
B. The maximum number of chromosome sets in the cells shown in the diagram can reach 4.
C. Nerve cells differentiated from iPS cells can be transformed back into cardiac muscle cells.
D. Liver cells obtained using iPS cells will not age or undergo apoptosis.
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B
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<image>As shown in the figure, 1. and 2. represent two ways of transmembrane transport. Which of the following statements is correct? ( )
A. 2. are both active transport
B. 1. is active transport, 2. is passive transport
C. 2. are both passive transport
D. 1. is passive transport, 2. is active transport
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B
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<image>Using highly effective cytotoxic drugs for chemotherapy can effectively kill tumor cells, but cytotoxins lack specificity and can also harm healthy cells while killing tumor cells. This limits their clinical application. Antibody-drug conjugates (ADCs) achieve selective killing of tumor cells by combining cytotoxins with monoclonal antibodies that can specifically recognize tumor antigens. ADCs typically consist of three parts: an antibody, a linker, and a drug (such as a cytotoxin). The mechanism of action is shown in the diagram. Which of the following statements is correct? ( )
A. Taq polymerase is needed in the preparation of monoclonal antibodies.
B. The transport method for ADCs entering tumor cells is facilitated diffusion.
C. Lysosomal rupture leads to the release of hydrolases, accelerating tumor cell death.
D. Cytotoxins have the ability to specifically bind to glycoproteins on the tumor cell membrane.
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C
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<image>Gibberellin can indirectly promote plant growth by increasing the content of auxin. Figure 1 shows the experimental method to verify this hypothesis, and Figure 2 is a schematic diagram of the synthesis and decomposition of auxin. Which of the following statements is incorrect? ( )
A. If gibberellin is applied to seedling 1, the decapitated coleoptile with the agar block will bend to the right.
B. To further investigate the mechanism by which gibberellin increases auxin content, the following hypotheses can be proposed: gibberellin promotes auxin synthesis, gibberellin inhibits auxin decomposition, or gibberellin promotes auxin synthesis while inhibiting auxin decomposition.
C. If gibberellin increases auxin concentration by promoting auxin synthesis, the hypothesis can be proposed that gibberellin promotes the transcription of auxin genes, thereby translating more auxin.
D. The number of seedling tips placed on the two identical agar blocks in Figure 1 should be equal.
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C
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<image>The figure shows a population growth curve. Which of the following statements is incorrect? ( )
A. Improving space and resource conditions is expected to increase the $$K$$ value.
B. In segment $$BC$$, the population growth rate gradually decreases, and the birth rate is less than the death rate.
C. During the change from $$A$$ to $$C$$, the predation success rate of natural enemies will increase.
D. Curve $$\text{Y}$$ indicates that the population growth is limited by environmental resistance.
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B
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<image>Poliovirus is a single-stranded positive-sense RNA virus. The diagram shows the replication process of this virus within a cell (processes 2 and 3 follow the principle of complementary base pairing). Which of the following statements is incorrect? ( )
A. The genetic information and codons of poliovirus are both located in the +RNA
B. The manner of complementary base pairing in process 2 is not exactly the same as in process 3
C. Enzyme X is RNA replicase
D. In the process where +RNA replicates to produce progeny +RNA, the number of purine bases consumed is equal to the number of pyrimidine bases consumed
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B
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<image>Based on the diagram, which of the following statements is correct? ( )
A. 3. Has centers for regulating blood sugar, body temperature, and biological clock
B. 2. Can coordinate movement, maintain balance, and is the lower center for somatic movement
C. The center for the urination reflex is in 3.
D. The basis of an unconditioned reflex is a conditioned reflex, which requires the involvement of 1.
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A
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<image>The table below shows the results of an investigation into the frequency of sensitive and resistant genotypes in three housefly populations. Houseflies develop resistance to insecticides due to the replacement of a leucine with a phenylalanine in a certain channel protein on the nerve cell membrane. Which of the following statements is correct? ( )
A. The frequency of the resistance gene in the three regions is $$2\%$$, $$4\%$$, and $$1\%$$, respectively.
B. The high frequency of the sensitivity gene in region C is the result of environmental selection.
C. Gene flow will not change the frequency of the resistance gene in the populations of the three regions.
D. The change in the amino acid in the channel protein is the result of a deletion of a gene base pair.
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B
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<image>Which of the following statements about the "$$S$$"-shaped curve in the diagram is correct? ( )
A. After introducing wild rabbits into a certain area, the change in their population size may resemble the curve in the diagram.
B. When paramecia are cultured in a medium of fixed volume, the change in their population size will eventually resemble the curve in the diagram.
C. The optimal time for fishing is during the period $$t_{2}$$.
D. The population growth rate is necessarily different at different times.
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A
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<image>The diagram shows a conceptual diagram of biological membranes (letters represent various biological membranes, where a is the nuclear membrane). Which of the following statements is correct? ( )
A. In the diagram, a, d, and e are composed of a bilayer of phospholipid molecules, while c is composed of a single layer of phospholipid molecules.
B. In the diagram, p is the site where glucose is converted to pyruvate.
C. The transformation from f to c in the diagram reflects the selective permeability of biological membranes.
D. In the diagram, f and h refer to the endoplasmic reticulum membrane and the Golgi apparatus membrane, respectively.
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D
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<image>Rabies is an acute infectious disease caused by the rabies virus, commonly seen in animals such as dogs and cats. Humans can become infected if bitten by an infected animal, and if not treated promptly, the mortality rate is extremely high. The diagram shows part of the immune process in the human body upon first infection with the rabies virus. Which of the following statements is incorrect? ( )
A. The produced antibodies will enter the target cells through endocytosis and bind to the parasitic virus
B. After being bitten by an infected animal, the wound should be cleaned promptly and anti-rabies serum should be injected at the hospital
C. When the human body is reinfected with the rabies virus, some cells in 5. can rapidly proliferate and differentiate into plasma cells
D. Belongs to immune cells, capable of recognizing, ingesting, and processing the virus
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A
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<image>The diagram shows a part of the carbon cycle. Which of the following statements is correct? ( )
A. In the food chain composed of producers, II, III, and IV in the diagram, energy flow is unidirectional and decreases step by step.
B. Producers are at the first trophic level, and the sum of 1, 2, 6, and 8 represents the total energy fixed by producers.
C. Processes 7 and 8 occur in the form of CO<sub>2</sub>, while processes 2, 3, 4, 5, and 6 occur in the form of carbon-containing organic matter.
D. When rhizobia and leguminous plants are in mutualistic symbiosis, the organic carbon needed for their life activities comes from process 6.
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C
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<image>As shown in the diagram, the submicroscopic structure model of the cell membrane is depicted. Which of the following statements is incorrect? ( )
A. 1. is glycoprotein, related to the rejection reaction between allogeneic cells in organ transplantation
B. 2. and 3. are mostly mobile
C. 3. forms the basic framework of the cell membrane and is unrelated to the movement of substances in and out
D. Vitamin $$\ce{D}$$ preferentially passes through the cell membrane because the basic framework of the cell membrane is 3.
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C
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<image>The diagram shows three neurons connected through synapses. If a strong stimulus is applied at the arrow, the positions where changes in membrane potential can be detected are ( )
A. 2.
B. 4.
C. 3, 4.
D. 2, 3.
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D
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<image>During the transportation of animals, changes in cortisol hormone levels in the body can regulate their ability to adapt to stimuli. The diagram below is a schematic of cortisol secretion regulation. Based on the diagram, which of the following statements is incorrect? ()
A. The structural basis for the increase in hormone secretion by the hypothalamus due to transportation stimuli is the reflex arc.
B. The process by which M promotes cortisol secretion in the diagram is a neuro-humoral regulation.
C. The target cells of cortisol also include hypothalamic cells and pituitary cells.
D. During the transportation of animals, the cortisol levels in the body first increase and then gradually return to normal.
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B
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<image>As shown in the diagram, the genotypes of a couple and their children's genotypes and corresponding phenotypes (bald and non-bald) are given. Another couple has the genotypes $$\ce{b^{+}b}$$ and $$\ce{bb}$$. What is the probability of having a non-bald child? ( )
A. $$1/2$$
B. $$1/3$$
C. $$1/4$$
D. $$3/4$$
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C
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<image>The cell membrane is the boundary of the cell and has various physiological functions. Which of the following statements about the diagram is incorrect? ( )
A. The secretion of substance a by cell A is related to the fluidity of the cell membrane.
B. Substance b has a recognition function and is located on the outside of the cell membrane.
C. The receptor b on cell B can recognize various signaling molecules.
D. The diagram mainly illustrates the cell membrane's ability to facilitate intercellular communication.
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C
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<image>The diagram shows the changes in the content of organic substances during the ripening period of apples. Which of the following analyses is incorrect? ( )
A. Starch stores more energy than fat of the same mass
B. Glucose in the diagram is often described as the "fuel of life"
C. Among the five organic substances in the diagram, the one most likely to contain the element S is the enzyme
D. It can be inferred from the diagram that fructose and sucrose are likely converted from starch
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A
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<image>The diagram shows the entire process of secretory proteins from synthesis to secretion outside the cell. Which of the following statements is incorrect? ( )
A. The structure that plays an important role as a transportation hub is the Golgi apparatus.
B. In the diagram, 1, 2, and 3 represent the endoplasmic reticulum, Golgi apparatus, and vesicles, respectively.
C. The process shown in the diagram can also occur in prokaryotic cells.
D. The structure represented by 4 is the mitochondrion.
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C
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<image>The analysis of the following concept map is incorrect ( )
A. A and B are fluid regulation and immune regulation, C and D can be body temperature and osmotic pressure
B. The physicochemical properties of the internal environment are not constant and unchanging
C. The relative stability of pH mainly relies on the buffering substances in the blood
D. More than 90% of the plasma osmotic pressure comes from Na<sup>+</sup> and Cl<sup>-</sup>
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D
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<image>Fragrance and non-fragrance in rice are a pair of contrasting traits controlled by a pair of genes, A and a. A research team conducted an experiment using fragrant and non-fragrant parent plants as shown in the diagram. Which of the following statements is incorrect? ( )
A. Fragrance is a recessive trait
B. Both parents are homozygous
C. When F<sub>2</sub> non-fragrant plants are self-pollinated, the offspring ratio of non-fragrant to fragrant is 6:1
D. The phenomenon where both dominant and recessive traits appear in F<sub>2</sub> when F<sub>1</sub> hybrids are self-pollinated is called trait segregation
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C
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<image>Diagram A represents the structure of a phospholipid molecule. In which organelles shown in Diagram B is it found? ( )
A. abcde
B. abcd
C. acde
D. bcde
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B
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<image>Diagram A is a schematic representation of a cell from a house mouse with XY sex determination during a certain stage of cell division (partial chromosomes shown). Diagram B shows the change in the number of chromosomes in a cell during three consecutive physiological processes. Which of the following is correct? ( )
A. The daughter cells of the cell in Diagram A are sperm cells.
B. The stage of the cell in Diagram A corresponds to the EF stage in Diagram B.
C. The reason for the change in chromosome number during stages DE and HI in Diagram B is the same.
D. In Diagram A, the same positions on chromosomes 1 and 2 have the t and T genes, respectively. This phenomenon is caused by the separation of alleles.
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B
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<image>The diagrams labeled A to D represent pedigrees of four different single-gene genetic disorders. Without considering gene mutations and chromosomal variations, which disorder can be ruled out as being controlled by a recessive gene on the X chromosome? ( )
A. A
B. B
C. C
D. D
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D
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<image>The diagram shows the chromosomal composition of a certain cell in a fruit fly. Which of the following statements is incorrect? ( )
A. The exchange of chromosome segments containing genes B and b will lead to genetic recombination on the chromatids.
B. Chromosomes 1, 3, 5, and 7 in the diagram can form a chromosome set.
C. If this cell undergoes meiosis, the cytoplasmic division will be equal.
D. The traits controlled by the genes on chromosomes 7 and 8 are linked to sex and exhibit crisscross inheritance.
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D
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<image>The image shows a part of a cell observed under an electron microscope. Which of the following statements about this cell is incorrect? ( )
A. This cell is a eukaryotic cell.
B. This cell must be an animal cell.
C. Structure 1 can provide energy during cell division.
D. Structures 2 and 3 do not contain phospholipid molecules.
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B
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<image>The diagram shows the main pathways of the carbon cycle in the biosphere. Which of the following statements is incorrect? ( )
A. A is the main component of the ecosystem
B. Carbon is transferred between B and D in the form of organic matter
C. C is the third trophic level in the food chain
D. There is a predation relationship between A, B, C, and D
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D
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<image>The table below shows an experiment designed by a group of students to investigate the 'changes of a steamed bun in the mouth'. Iodine solution was added and the test tube was shaken. The color change in the test tube is ().
A. Both test tube 1 and test tube 2 turn blue
B. Neither test tube 1 nor test tube 2 turns blue
C. Test tube 1 turns blue, test tube 2 does not turn blue
D. Test tube 1 does not turn blue, test tube 2 turns blue
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D
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<image>The diagram shows a schematic of body temperature regulation in the human body. Which of the following statements is incorrect? ( )
A. When exposed to cold stimuli, the secretion of hormones a, b, c, and d will all increase.
B. The diagram reflects the characteristic of hierarchical regulation of hormones.
C. The hypothalamus is the main center for sensing temperature changes and is the location where cold and heat sensations are formed.
D. Increased secretion of hormones c and d can enhance the metabolic activity of skeletal muscles and internal organs, increasing heat production.
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C
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<image>A certain interest group treated newly sprouted soybean sprouts with different concentrations of auxin. Three days later, they observed the growth of the hypocotyl as shown in the figure ("-" indicates no auxin treatment, "+" indicates auxin treatment, and more "+" indicates higher hormone concentration). This experiment can serve as a preliminary experiment to explore the optimal concentration of auxin for promoting hypocotyl elongation. Which of the following statements is correct? ( )
A. The preliminary experiment can test the scientific validity and feasibility of the experimental design, reducing experimental errors.
B. In the formal experiment, it is necessary to design a blank control group without auxin.
C. The results shown in the figure indicate that the effect of auxin is dual.
D. The slower growth of group D compared to group C may be related to the induction of ethylene production due to increased auxin concentration.
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D
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<image>The diagram shows the ultrastructure of the cell membrane. Which of the following statements is incorrect? ( )
A. The basic framework of the cell membrane is 2.
B. The complexity of the cell membrane's functions is mainly related to 1.
C. 1. is stationary, but 2. is mobile, so the cell membrane has fluidity.
D. Side A is the extracellular side.
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C
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<image>Some students in a class conducted a survey on a monogenic hereditary disease and drew and analyzed a pedigree chart of one of the families (as shown in the figure). Which of the following statements is correct? ( )
A. This disease is an autosomal dominant hereditary disease
B. The probability of II-5 and II-6 having a boy with the disease is \frac{1} {4}
C. II-6 is a carrier of the disease-causing gene
D. If III-9 marries a normal woman, it is recommended to have a girl
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B
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<image>The desire for beauty is universal, and a few freckles can make beauty-loving women unhappy. Most freckles are hereditary and are inherited in an autosomal dominant manner. Which of the following statements about hereditary freckles is correct? ( )
A. Freckles that appear on a person who often sunbathes on the beach will definitely be passed on to their offspring.
B. When investigating the prevalence of hereditary freckles in a population, if only the families of patients are surveyed, the results will be underestimated.
C. A couple both heterozygous for hereditary freckles have a daughter with freckles. If she marries a normal man, the probability of having a son with hereditary freckles is .
D. Among the three genetic disorders: sickle cell anemia, hereditary freckles, and Down syndrome (trisomy 21), only two can be diagnosed under a microscope.
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D
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<image>The diagram shows the relationships between some biological components in a small grove in Huangzhou Red Cliff Park. Which of the following statements is correct? ( )
A. The body color of the insect is similar to its habitat, which reflects that organisms influence the environment.
B. The diagram contains multiple food chains, one of which is plants $$\to$$ insects $$\to$$ birds $$\to$$ bacteria.
C. If sunlight, air, and other abiotic components are added to the diagram, it constitutes an ecosystem.
D. The bacteria and fungi in the diagram are all prokaryotic organisms, while plants, insects, and birds are all eukaryotic organisms.
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C
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<image>The diagram shows the carbon cycle process in the biosphere. Which of the following statements is correct? ( ).
A. Process 1 represents photosynthesis in green plants, and process 2 represents chemosynthesis.
B. This diagram can represent both the material cycle process and accurately represent the energy flow process.
C. The carbon cycle refers to the transfer of carbon elements in the form of organic matter between A, B, C, and D.
D. All the populations contained in A, B, C, and D together form a biological community.
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D
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<image>In a certain spermatogonium, m and n are a pair of homologous chromosomes, where m is a normal chromosome, and A to E represent genes. A special process occurs after the synapsis of this pair of homologous chromosomes, as shown in the diagram, where the chromosomal bridge randomly breaks during division, and the subsequent division process proceeds normally. Which of the following statements is incorrect? ( )
A. The chromosomal bridge structure in the diagram may appear in metaphase I of meiosis, but generally does not appear in metaphase II
B. The chromosomes in the resulting sperm cells may have structural variations such as inversions and deletions
C. The proportion of sperm containing abnormal chromosomes produced by this spermatogonium through meiosis is \frac{3} {4}
D. The lost fragments will eventually be decomposed by various hydrolytic enzymes in the cell into six small organic molecules
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D
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<image>The process of cellular respiration is shown in the diagram, where 1 to 3 represent the locations where related physiological processes occur, and A and B represent related substances. Which of the following statements is incorrect? ( )
A. Hydrogen is released in 3.
B. 1 and 2 are the cytosol, and 3 is the mitochondria.
C. If B is lactic acid, then ATP can be produced in 1, 2, and 3.
D. If the physiological process shown in the diagram occurs in yeast cells, B is ethanol and $$\ce{CO_{2}}$$.
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C
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<image>A student wants to investigate the 'effect of different nutrient solutions on the cultivation of Paramecium'. The experimental design is shown in the table below. Which of the following suggestions for improving the experiment is unreasonable? ().
A. Use straw extract uniformly
B. Set the temperature of the nutrient solution uniformly to $$25degreehbox{C}$$
C. Change the number of Paramecium to 20
D. Set up a control group using plain water as the culture medium
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A
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<image>The diagram illustrates the process of genetic improvement using protoplast culture from cotton mesophyll cells. According to the diagram, which of the following is incorrect? ( )
A. 1. The process requires treatment with cellulase and pectinase under suitable conditions.
B. 2. The purpose of the process is to induce gene mutations in a directed manner.
C. 3. During the process, the mesophyll cells lose their specific structure and function.
D. 4. The process requires treatment with appropriate concentrations of auxin and cytokinin.
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B
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<image>Certain bacteria have a stable metabolic pathway for synthesizing arginine, as shown in the diagram. Which of the following statements is correct? ( )
A. The genes controlling the synthesis of enzyme 1, enzyme 2, and enzyme 3 follow the law of segregation genetically.
B. The reason for the relatively stable arginine content in these bacteria may be related to a negative feedback regulation mechanism.
C. When synthesizing arginine, these bacteria express three pairs of alleles successively to produce the corresponding enzymes.
D. Providing these bacteria with intermediate product II will result in the genes controlling enzyme 1 and enzyme 2 not being expressed.
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B
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<image>The diagram shows a metabolic pathway of a certain substance within a microorganism. Which of the following statements about enzyme activity regulation is incorrect? ( )
A. Substance D is both the product catalyzed by enzyme 3 and the feedback inhibitor of enzyme 3.
B. Substance E may cause enzyme 4 to lose its activity by binding to it and altering its structure.
C. When either substance D or E is in excess, the activity of enzyme 1 will be inhibited.
D. If the end product of this metabolism is continuously excreted, it can eliminate the inhibitory effect of substance C on enzyme 1.
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C
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<image>To study the effect of temperature on the activity of a certain enzyme, three experimental groups were set up: a 20°C group, a 40°C group, and a 60°C group, keeping other conditions the same. The concentration of the product in each group was measured at different reaction times, as shown in the figure. Which of the following statements is incorrect? ( )
A. In all three experimental groups, the rate of the enzyme-catalyzed reaction is fast at first and then slows down.
B. Under the three temperature conditions, the enzyme activity is highest in the 40°C group.
C. Before t<sub>1</sub>, if the temperature of the 20°C group is increased by 10°C, the rate of the enzyme-catalyzed reaction will increase.
D. At t<sub>2</sub>, if the amount of substrate in the 60°C group reaction system is increased by 2 times, while keeping other conditions unchanged, the total amount of product in this group will also increase by 2 times.
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D
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<image>The diagram represents a certain process occurring in a human cell. Which of the following statements is incorrect? ( )
A. The template for this process is provided by mRNA
B. Water is produced during this process
C. There are as many types of tRNA as there are codons
D. This process in the diagram does not fully represent the content of the 'central dogma'
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C
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<image>Among the four pairs of contrasting traits in fruit flies, red eyes (E) are dominant over white eyes (e), gray body (B) is dominant over black body (b), long wings (V) are dominant over vestigial wings (v), and narrow eyes (R) are dominant over broad eyes (r). The diagram shows the distribution of four pairs of alleles on the chromosomes of a certain fruit fly. Which inference is incorrect? ( )
A. The phenotype of the fly's eyes is red and narrow
B. This fruit fly cannot produce BV egg cells
C. If this fruit fly is crossed with a red-eyed individual of the opposite sex, the offspring may have white eyes
D. If this fruit fly is crossed with a bbrr individual, the proportion of offspring with gray bodies and narrow eyes is \frac{1} {2}
|
D
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|
<image>Below is a segment of a polypeptide chain and a segment of the DNA double strand that controls its synthesis. "-Methionine-Proline-Threonine-Glycine-Valine-" Based on the above material, which of the following descriptions is incorrect? ( ) Codon table: Methionine AUG, Proline CCA, CCC, CCU, Threonine ACU, ACC, ACA, Glycine GGU, GGA, GGG, Valine GUU, GUC, GUA
A. Strand 1 of this DNA acts as the transcription template
B. The genetic codons determining this polypeptide chain are AUG, CCC, ACC, GGG, GUA in sequence
C. This polypeptide chain contains 4 "-CO-NH-" structures
D. If the second base T on the right side of strand 2 of this DNA is replaced by G, there will be two prolines in this polypeptide
|
D
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|
<image>Scientists conducted the following experiment: they marked dark-colored and light-colored peppered moths separately, then released them in different locations. After a period of time, they attempted to recapture as many of the released moths as possible and recorded their numbers, as shown in the table below. (1) The difference in body color of the peppered moths is a phenomenon of ___ (fill in "heredity" or "variation"). Assuming that the dark color is controlled by a dominant gene (represented by $$\text{B}$$) and the light color by a recessive gene (represented by $$\text{b}$$), the genetic composition of the dark-colored moths could be ___ or ___. (2) From the table, it can be seen that the peppered moths living in different environments have different protective colors. According to Darwin's theory, the formation of protective coloration is ( ).
A. The result of artificial selection
B. The result of natural selection
C. A natural phenomenon that cannot be explained
D. A display of animal intelligence
|
B
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|
<image>The diagram shows the relative flow rate of blood per unit area through the skin vessels of a person at rest. At time A, the room temperature suddenly rises from 15°C to 40°C, and at time B, the room temperature suddenly drops back to 15°C. Which of the following statements is correct?
A. During the AB period, the skin blood vessels constrict, and blood flow increases.
B. During the AB period, because the external environment temperature is higher than the body temperature, the body does not dissipate heat.
C. During the AB period, the activity of enzymes in the body is higher than during the BC period.
D. During the BC period, the secretion of thyroid hormones and adrenaline increases.
|
D
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|
<image>In diagram A, there is a simplified representation of a pair of sex chromosomes of a certain animal (XY type sex determination). Sections 1 and 2 have a part that is homologous (segment I), and another part that is non-homologous (segments II<sub>1</sub> and II<sub>2</sub>). Diagram B shows the pedigree of certain single-gene hereditary diseases in this animal. Which of the following analyses is incorrect? ( )
A. In diagram A, 1 and 2 can represent the sex chromosome diagram of a fruit fly.
B. In the population of this animal, there are no alleles for genes located on segments II<sub>1</sub> and II<sub>2</sub>.
C. The inheritance of traits controlled by genes on the homologous segment I in diagram A is related to sex.
D. Without considering factors such as gene mutation, ABC in diagram B definitely do not belong to recessive genes controlled by segment II<sub>2</sub>.
|
B
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|
<image>The food relationships among the main species in a certain ecosystem are shown in Diagram A, while Diagram B represents the environmental carrying capacity and the actual population size at a certain time for three species 1, 2, and 3 in the ecosystem. Based on the diagrams, which of the following statements is incorrect? ( )
A. In the food web of Diagram A, H occupies the third and fourth trophic levels.
B. From Diagram B, it can be seen that intraspecific competition is most intense for species 2.
C. If 60% of the total food for organism A is obtained directly from B, then for A to increase by 10kg, at least 130kg of B is needed.
D. In addition to the components shown in Diagram A, decomposers should also be included in the components of the ecosystem.
|
D
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|
<image>The diagram shows a schematic representation of the structure of a paramecium. Based on the diagram, which of the following structure-function pairings is correct? ( )
A. 3. is the oral groove, which can engulf bacteria and obtain food.
B. 2. is the cell wall, which has respiratory and excretory functions.
C. 7. is the food vacuole, used for digesting food and absorbing nutrients.
D. 5. is the cytoproct, used for expelling excess water from the body.
|
A
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|
<image>Regarding the phenomenon shown in the image, which explanation is incorrect? ( )
A. The different colors of the "fuzz" indicate that the molds are not of the same type.
B. The "fuzz" seen is a colony of mold.
C. The "fuzz" seen is a colony formed by bacteria.
D. Oranges are prone to mold because they can provide moisture and organic matter for microbial growth.
|
C
|
|
<image>The diagram represents the exchange relationships of substances in the body fluids of a normal human. a and b represent substances. Which of the following statements is correct? ( )
A. Compared to X, the protein content in Z is higher.
B. The volume of fluid entering Y from X is greater than that entering Z.
C. a can represent urea, CO<sub>2</sub>, and b can represent glycogen, amino acids.
D. The release of cellular metabolic products can cause Y to become acidic.
|
B
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|
<image>In the diagram, one of the homologous chromosomes in individuals A and B has undergone a mutation (letters represent chromosome segments). The left side of diagram C shows the HTT gene of a healthy person, while the right side shows the HTT gene of a patient. Which of the following statements is correct? ( )
A. Individual A has undergone a change in chromosome number.
B. The tetrad formed during meiosis in individual B's cells is normal.
C. The type of mutation in individual C is duplication.
D. The mutations in individuals A and B can be observed and examined under a microscope.
|
D
|
|
<image>Which of the following statements about the diagram of the chromosomes in a Drosophila somatic cell is correct? ( )
A. This diagram represents the chromosomal composition of a female Drosophila somatic cell.
B. The X chromosome and Y chromosome are a pair of sex chromosomes.
C. This diagram shows that there are 4 chromosome sets in the somatic cell of Drosophila.
D. This diagram shows that there are 6 chromosomes in the somatic cell of Drosophila.
|
B
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|
<image>A research group used the experimental setup shown in the figure to conduct an enzyme study. Which of the following analyses is incorrect? ( )
A. A large amount of gas is produced in the experiment, suggesting that fresh potato slices contain H<sub>2</sub>O<sub>2</sub> enzyme
B. After a period of time, the amount of gas in the graduated cylinder no longer increases due to the limited number of potato slices
C. If the number of fresh potato slices is appropriately increased, the rate of bubble production in the graduated cylinder will accelerate
D. Replacing fresh potato slices with manganese dioxide in the experiment can be used to demonstrate the specificity of enzymes
|
B
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|
<image>The diagram below shows the pedigree of two genetic diseases, A and B, in a certain family. Genetic disease A is controlled by a pair of alleles (A, a), and genetic disease B is controlled by another pair of alleles (B, b). These two pairs of alleles are inherited independently. It is known that individual III-4 carries the pathogenic gene for genetic disease A but does not carry the pathogenic gene for genetic disease B. Which of the following statements is correct? ( )
A. The pathogenic genes for diseases A and B are located on the X chromosome and autosomes, respectively.
B. III-3 is in a direct blood relationship with II-1, II-2, III-1, and III-4.
C. The pathogenic genes for diseases A and B in this family come from I-1 and I-2, respectively.
D. If III-3 and III-4 have another child, the probability of the child having both diseases is 1/24.
|
D
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|
<image>(2016 Spring • Handan School-Level Monthly Exam) Plant A is a diploid rice plant. Plant B was obtained from Plant A, and then Plants C and D were obtained using Plants A and B. The cultivation process is shown in the diagram. Which of the following statements is correct? ( )
A. Treating the seedlings of Plant A with colchicine can produce Plant B
B. The number of chromosome sets in the somatic cells of Plant C and Plant D is the same
C. Anther culture of Plant D can produce triploid Plant C
D. The processes of obtaining Plant C and Plant D both belong to sexual reproduction
|
A
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|
<image>The diagram shows the ultrastructural model of the cell membrane, where 1.-3. represent the substances that make up the cell membrane. Which of the following statements is incorrect? ( )
A. 3. is stationary and does not move
B. Forms the basic framework of the cell membrane
C. Glucose requires the assistance of 2. to pass through the cell membrane
D. Cell recognition is related to glycoprotein 1.
|
A
|
|
<image>The diagram respectively represents the relationship between temperature, pH, and enzyme activity (rate of enzyme-catalyzed reaction). Which of the following statements is correct? ( )
A. According to curve P, this enzyme is suitable for storage at 80°C.
B. The activity of pepsin in the human body is similar to curve Q.
C. Curves Q and R indicate that the optimal temperature of the enzyme does not change at different pH levels.
D. Enzyme activity increases first and then decreases as pH rises.
|
B
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|
<image>The diagram below represents part of the process of photosynthesis in green plants, where a-c represent related substances, and structures A and B are indicated. Which of the following statements is correct? ( )
A. Structure A is the chloroplast, and structure B is the cytoplasmic matrix
B. a, b, and c are O<sub>2</sub>, NADPH, and ADP, respectively
C. Most of the ATP synthesized in this process is transported out of the chloroplast for various life activities of green plants
D. When other conditions are suitable, an appropriate increase in CO<sub>2</sub> concentration will increase the production rate of a
|
D
|
|
<image>The diagram represents a concept map related to protein molecules. Which of the following statements about the diagram is incorrect? ( )
A. In a polypeptide with a molecular weight greater than $$\number{10000}$$, there can be $$20$$ types of $$\unit{A}$$
B. The $$\unit{N}$$ element in proteins is mainly found in $$\unit{B}$$
C. The number of $$\unit{A}$$ in a polypeptide is generally greater than the number of $$\unit{B}$$
D. The diversity of protein structure and function depends on the diversity of $$\unit{A}$$
|
D
|
|
<image>The diagram shows part of the regulatory process when the osmotic pressure of extracellular fluid in the human body increases, where A, B, and C represent structures. Which of the following statements is incorrect? ( )
A. Factors such as insufficient water intake and excessive water loss in the body can cause an increase in extracellular fluid osmotic pressure.
B. Antidiuretic hormone acts on structure C and can increase the amount of urine produced.
C. Antidiuretic hormone is synthesized in the cells of structure A, released by structure B, and then travels throughout the body with the bloodstream.
D. After the osmotic pressure of extracellular fluid increases, increasing water intake helps maintain the osmotic pressure of extracellular fluid relatively constant.
|
B
|
|
<image>In the diagram, A and B respectively represent the coordinate graph and model diagram of substances entering and exiting the cell. The common feature of the two types of transmembrane transport shown in A and B is
A. Both require energy
B. Both require assistance from membrane proteins
C. Both transport along the concentration gradient
D. Both transport against the concentration gradient
|
B
|
|
<image>When observing the cell structures of three organisms (denoted as $$M$$, $$N$$, and $$P$$) using an electron microscope, it was found that their cell structures $$a$$ to $$e$$ have the following characteristics: $$a$$, $$b$$, and $$c$$ all have double membranes, with small pores on the membrane of $$a$$, but no pores on the membranes of $$b$$ and $$c$$; $$d$$ is related to mitosis; $$e$$ is composed of vesicular structures. Based on the comparison table of the cell structures of samples $$M$$, $$N$$, and $$P$$, determine which $$M$$, $$N$$, and $$P$$ are respectively (Note: "$$+$$" indicates presence, "$$-$$" indicates absence) ( )
A. Spinach leaf, Escherichia coli, mouse liver
B. Escherichia coli, mouse liver, spinach leaf
C. Escherichia coli, spinach leaf, mouse liver
D. Mouse liver, spinach leaf, Escherichia coli
|
C
|
|
<image>The diagram below is a schematic representation of various structures within human tissues. A, B, and C represent structures, and 1, 2, 3, 4 represent fluids. The statement about this diagram that is incorrect is
A. Can enter A, B, C
B. The highest concentration of CO<sub>2</sub> is in 2.
C. The fluid with the lowest concentration of O<sub>2</sub> in the diagram is 3.
D. 2, 3, and 4 make up the body fluids, among which 1, 2, and 4 constitute the internal environment
|
B
|
|
<image>A certain interest group conducted an experiment on anaerobic respiration of yeast at room temperature (as shown in the figure). Which of the following analyses is incorrect? ( )
A. The bubbles emerging from the dropper are the result of CO<sub>2</sub> produced by the reaction
B. The main purpose of adding water to the test tube is to create an anaerobic environment
C. If the water in the test tube is replaced with cold water, the rate of bubble release decreases
D. Some of the energy from the decomposed glucose is transferred to ATP, while the rest remains in the alcohol
|
D
|
|
<image>The diagram shows several stages of mitosis in a cell. Analyze the following statements and identify which one is incorrect ( )
A. The number of chromosomes in stage 2 and stage 3 is equal
B. The parent cell in stage 4 has 4 chromosomes
C. The cell in stage 1 contains 4 chromosomes
D. Stage 1 is the best stage to observe and identify the morphology and number of chromosomes
|
D
|
|
<image>The diagram shows the effects of glands and hormones on the development of frogs. In the diagram, 1, 2, and 3 represent three different hormones. The development process is roughly divided into two stages: in the first 20 days, the tadpole's hypothalamus, pituitary gland, and thyroid gland are not yet mature; in the latter 20 days, they gradually mature. Which of the following statements is correct? ( )
A. In the first 20 days, the levels of 1, 2, and 3 are relatively low and gradually increase during this period.
B. Continuously feeding tadpoles with iodine-rich food can cause them to develop into small adult frogs before 20 days.
C. If a tadpole cannot develop into an adult frog after the pituitary gland is removed, it indicates that the function of thyroid-stimulating hormone is to promote development.
D. Removing the pituitary gland of an adult frog may cause the thyroid gland to atrophy, and the levels of 1, 2, and 3 will all decrease.
|
A
|
|
<image>The human X and Y chromosomes have homologous regions (II) and non-homologous regions (I, III) as shown in the diagram. The incorrect inference is ( )
A. Genes in region I exist only in females
B. Genes in region III exist only in males
C. Male primary spermatocytes contain both X and Y chromosomes
D. If the gene H/h is located in region II, there are 4 genotypes for the H/h gene in males
|
A
|
|
<image>A research team conducted an experiment using starch and salivary amylase to investigate factors affecting enzyme activity. The experimental results are shown in the figure. The incorrect statement is ( )
A. It can be inferred from the figure that the optimal temperature for salivary amylase activity is 37°C
B. At 60°C, the spatial structure of the enzyme has already been damaged
C. At the same pH but different temperatures, the activity of salivary amylase must be different
D. There is no control group in this experiment, all are experimental groups
|
C
|
|
<image>The diagram shows a schematic representation of a protein molecule composed of 153 amino acids. It is known that the formation of a disulfide bond is as follows: -SH + -SH → -S-S- + 2H. Which of the following statements is correct? ( )
A. This protein molecule contains 152 peptide bonds
B. During the formation of this protein molecule, 153 water molecules are produced
C. In this protein molecule, there is 1 amino acid with sulfur in the R group
D. Complete hydrolysis of this protein molecule will produce 153 types of amino acids
|
B
|
|
<image>Which of the following statements aligns with the trend shown in the curve in the diagram ( )
A. The trend of the number of roots formed from cuttings with changes in auxin concentration
B. The trend of plant water absorption rate with changes in external solution concentration
C. The trend of enzyme activity in human tissue cells with changes in environmental temperature
D. The trend of photosynthesis rate with changes in environmental carbon dioxide concentration
|
D
|
|
<image>The yellow color of pea cotyledons $$(\text{Y})$$ and round seeds $$(\text{R})$$ are both dominant traits. The phenotype of the $$\text{F}_{1}$$ generation from a cross between two parent pea plants is shown in the image. When the yellow round peas from the $$\text{F}_{1}$$ generation are crossed with green wrinkled peas, the phenotypic ratio in the $$\text{F}_{2}$$ generation is ( )
A. $$9:3:3:1$$
B. $$3:1:3:1$$
C. $$1:1:1:1$$
D. $$2:2:1:1$$
|
D
|
|
<image>The diagram shows the family pedigree related to two genetic diseases, A and B. Which of the following analyses is incorrect? ( )
A. Based on the pedigree, the inheritance pattern of disease A can be determined, but not that of disease B.
B. If individual II<sub>9</sub> does not carry the pathogenic gene for disease B, then the gene for disease B in III<sub>11</sub> comes from individual I<sub>2</sub>.
C. If III<sub>14</sub> carries the pathogenic genes for both diseases A and B, then the probability that III<sub>12</sub> is a heterozygote is \frac{2} {3}
D. If III<sub>14</sub> carries the pathogenic genes for both diseases A and B, the probability that a child of III<sub>13</sub> and III<sub>14</sub> will be affected is \frac{1 3} {4 8}
|
C
|
|
<image>The diagram shows the structure and physiological changes at the neuromuscular junction in a reflex arc. During a reflex, the excitation generated by the nerve center travels along the efferent nerve to the presynaptic membrane, causing synaptic vesicles to fuse with the presynaptic membrane and release the neurotransmitter (Ach). Which of the following statements is incorrect? ( )
A. After Ach binds to the Ach receptor, the muscle membrane undergoes a change in potential, causing muscle contraction.
B. Ach receptors are specific and are generally composed of proteins.
C. The formation of synaptic vesicles is related to the Golgi apparatus.
D. Ach is released from the presynaptic membrane and passes through two membranes.
|
D
|
|
<image>Regarding the protein shown in the diagram, which of the following statements is correct?
A. Contains two polypeptide chains
B. Has a total of 126 peptide bonds
C. Contains a total of 17 amino groups
D. A total of 125 water molecules are removed during the formation of this protein
|
A
|
|
<image>The diagram shows the relationship between light intensity and plant photosynthesis. Which of the following statements about the curve is incorrect? ( )
A. b represents the accumulation of dry matter in plants under light
B. The size of m is related to the intensity of plant respiration
C. After point n, the amount of CO<sub>2</sub> absorbed by the plant no longer increases, which is related to the number of enzymes in the chloroplasts
D. If a plant is in a natural environment with light intensity of m for a long time, it can still grow normally
|
D
|
|
<image>In this diagram of energy flow in an ecosystem (partial), which of the following statements is correct? ( )
A. The total energy assimilated by primary consumers is (B<sub>2</sub>+C<sub>2</sub>+D<sub>2</sub>+A<sub>2</sub>)
B. The total energy flow in this ecosystem is (B<sub>2</sub>+C<sub>2</sub>+D<sub>2</sub>)
C. The energy transfer efficiency from producers to primary consumers is D<sub>1</sub>/B<sub>1</sub>+C<sub>1</sub>+D<sub>1</sub>
D. In the diagram, B<sub>1</sub> represents the energy used by producers for their own growth, development, and reproduction
|
A
|
|
<image>To study the mechanism of blood glucose regulation, researchers performed specific treatments on a certain part of the pancreas of normal mice, resulting in two types of model mice, Type A and Type C, with Type B being normal mice. The mice of types A, B, and C were subjected to feeding without exercise and feeding with exercise, and the changes in blood glucose concentration were measured (as shown in the image). Which of the following statements is incorrect? ( )
A. When fed but not exercising, the main reason for the decrease in blood glucose concentration in Type A mice is the conversion of glucose into glycogen and non-sugar substances
B. Type A mice may have a dysfunction in the secretion of pancreatic B cells, and Type C mice may have a dysfunction in the secretion of pancreatic A cells
C. The insulin content in the blood of Type A mice is low, and the glucagon content in the blood of Type C mice is low
D. After feeding and exercising, the continuous decrease in blood glucose concentration in Type C mice may lead to shock
|
A
|
|
<image>Vitamin D-resistant rickets is an X-linked dominant genetic disorder, while hemophilia is an X-linked recessive genetic disorder. The diagram shows a pedigree of a genetic disorder. Which of the following statements is incorrect?
A. The disorder could be vitamin D-resistant rickets
B. The disorder could be hemophilia
C. If individual III-7 marries a normal male, and there is no gene for this disorder in the male's family, the probability of their offspring having the disorder is 0
D. It is best to choose single-gene genetic disorders with a higher incidence rate in the population when investigating genetic disorders
|
B
|
|
<image>The diagram shows the cell cycle of mitosis in the epithelial cells of a certain animal's small intestine. 1 to 4 correspond to each phase, with 2 being the S phase. The arrow indicates the direction of the cell cycle, and h represents hours. The duration of the interphase of this cell division is ( )
A. 9h
B. 5h
C. 3h
D. 8h
|
B
|
|
<image>The diagram illustrates the relationships between the following terms. 1, 2, and 3 are respectively ( )
A. Prokaryotes, Nostoc, Bacteria
B. Cells, Viruses, Prokaryotic Cells
C. Proteins, DNA, Hemoglobin
D. Deoxyribonucleic Acid, Ribonucleic Acid, Nucleic Acid
|
A
|
|
<image>As shown in the figure, to identify the parent-child relationship between individual 8 and this family, a special method is required. Which of the following methods is feasible? ( )
A. Compare the X chromosome DNA sequence of 8 and 1
B. Compare the Y chromosome DNA sequence of 8 and 3
C. Compare the Y chromosome DNA sequence of 8 and 5
D. Compare the X chromosome DNA sequence of 8 and 2
|
C
|
|
<image>The curve shown in the figure illustrates two methods by which the human body acquires immunity. Based on this, which of the following statements is correct? ( )
A. When a person is bitten by a rabid dog, they may be infected with the rabies virus. In this case, it is better to use method $$2$$ for immunity.
B. Using method $$1$$ can provide a person with more lasting immunity than method $$2$$.
C. In medicine, method $$2$$ is generally used for immunization prevention.
D. The process by which the body acquires antibodies using method $$2$$ is called cellular immunity.
|
C
|
|
<image>Based on the diagram, which statement about the nerve cell is incorrect? ( )
A. When a sufficiently strong stimulus is applied at point 3, potassium ions flow from top to bottom, generating an action potential.
B. The formation of the resting potential may be related to carriers such as 2 and 5 on the membrane.
C. If this diagram represents a postsynaptic membrane, the synaptic cleft is located on the A side of the illustrated membrane.
D. If the phospholipid layer of the nerve cell membrane is spread out at the air-water interface, 3 is in contact with the water surface.
|
A
|
|
<image>Under optimal conditions, an irreversible chemical reaction proceeds until time t<sub>1</sub>, at which point an enzyme (composed of protein) that catalyzes the reaction is added. The change in reactant concentration over time before and after the addition of the enzyme is shown in the diagram. Which of the following analyses is correct? ( )
A. When the reaction time reaches t<sub>2</sub>, the enzyme completely loses its activity
B. Appropriately increasing the temperature of the reaction system will shift t<sub>2</sub> to the left
C. The rate of decrease in reactant concentration after t<sub>1</sub> can represent the rate of the enzyme-catalyzed chemical reaction
D. Due to the limitation of reactant concentration, the rate of the enzyme-catalyzed reaction gradually slows down from t<sub>1</sub> to t<sub>2</sub>
|
D
|
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