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<image>The diagram shows the relationship between the absorption of $$\rm{O_2}$$ and the release of $$\rm{CO_2}$$ in a non-green organ of a certain plant under different $$\rm{O_2}$$ concentration conditions, where the line segment XY = YZ (the respiratory substrate is glucose). Then, when the $$\rm{O_2}$$ concentratio... | C | |
<image>The diagram shows the fluid mosaic model of the cell membrane. Which of the following statements is incorrect? ( )
A. The side labeled 1 is the exterior side of the cell membrane.
B. 1 is related to the recognition of the cell surface.
C. 2 forms the basic framework of the cell membrane.
D. The selective perme... | D | |
<image>In diagram A, a schematic representation of chromosomes and genes of a mammal AaBb at different stages of cell division is shown. Diagram B illustrates the curve of the number of homologous chromosome pairs in the cell at different stages of division. Which of the following statements is correct? ( )
A. In cel... | C | |
<image>The diagram below shows images of different stages of mitosis in a cell of a certain organism. Which of the following descriptions of the images is incorrect? ( )
A. Cells A, B, and C are in prophase, anaphase, and metaphase of mitosis, respectively.
B. The ratio of the number of chromosomes to chromatids to DNA... | B | |
<image>The diagram shows the energy flow in an ecosystem. Which of the following equations cannot be true? ( )
A. B<sub>2</sub>=A×(10%-20%)
B. A=F+B<sub>1</sub>+C<sub>1</sub>+D<sub>1</sub>+E<sub>1</sub>
C. A-(B<sub>1</sub>+B<sub>3</sub>)=C<sub>1</sub>+C<sub>2</sub>+C<sub>3</sub>
D. C<sub>3</sub>=B<sub>2</sub>×(80%-90... | D | |
<image>The following four images depict cells in four different states of division from the same organism. Which of the following statements is correct? ( )
A. The normal somatic cells of this organism contain 16 chromosomes
B. The ratio of DNA content between the cells shown in Image 1 and Image 3 is 1:2
C. The proc... | C | |
<image>The partial metabolic pathway of phenylalanine in the human body is shown in the diagram below. Based on the diagram, which of the following is correct? ( )
A. Enzyme 1 is not involved in the synthesis of melanin
B. The synthesis of melanin is only related to enzyme 2
C. Genes directly control traits by contro... | D | |
<image>The diagram shows a model of material exchange between a certain tissue cell and the internal environment. Position 5 is the arterial inflow end, and position 1 is the venous outflow end. Which of the following statements is correct? ( )
A. The water in both 1 and 5 comes from 2 and 3.
B. If 3 is an islet B cell... | B | |
<image>Protein engineering is a newly emerging field of bioengineering, also known as second-generation genetic engineering. The diagram below illustrates the process of protein engineering, where $$A$$ and $$B$$ in genetics represent ( ).
A. Transcription and translation
B. Translation and transcription
C. Replicati... | A | |
<image>The diagram below is a schematic representation of the regulation of human growth hormone secretion. Which of the following statements is incorrect? ( )
A. If the secretion of growth hormone increases, it may promote the secretion of cell b
B. Cells a and b have a synergistic relationship in regulating the sec... | B | |
<image>The diagram shows the pathways of carbon and hydrogen elements during photosynthesis and cellular respiration in spinach mesophyll cells, where 1 to 6 represent relevant physiological processes. Which of the following statements is incorrect? ( )
A. Processes 1, 2, and 3 do not occur on biological membranes
B. T... | D | |
<image>Chlorophyll pigments were extracted from the leaves of the same type of plant grown under normal indoor light and strong outdoor light, and separated using paper chromatography, with results as shown in the diagram. Which of the following statements is correct?
A. The leaves of the indoor plants are more yello... | D | |
<image>The diagram shows the growth conditions on sides A and B of an oat coleoptile after unilateral light exposure, with the control group not subjected to unilateral light treatment. Which of the following statements is correct? ( )
A. The number of cells on side A is significantly greater than on side B
B. Side B... | C | |
<image>The diagram shows the relationship between different stages of cell division and the changes in DNA content per chromosome. Which of the following analyses of the diagram is incorrect? ( )
A. The formation of phosphodiester bonds by DNA polymerase occurs only in segment AB
B. In segment BC, the number of chromos... | C | |
<image>In pea seeds, yellow color (Y) is dominant over green (y), and round shape (R) is dominant over wrinkled shape (r). When purebred parents with two pairs of contrasting traits are crossed, the F<sub>1</sub> generation is obtained. The F<sub>1</sub> generation is self-crossed, and the distribution of phenotypes in... | C | |
<image>The diagram shows the relationship between enzyme activity and temperature. Which of the following statements is correct? ( )
A. When the reaction temperature is adjusted from b to the optimal temperature, enzyme activity will definitely increase.
B. When the reaction temperature is adjusted from a to the optima... | B | |
<image>A class of students investigated a single-gene hereditary disease and analyzed a pedigree chart of one family. Which of the following analyses is incorrect? ( )
A. The inheritance pattern of this disease is either autosomal recessive or X-linked recessive.
B. Individuals 1 and 4 definitely carry the pathogenic... | D | |
<image>The diagram shows the effect of different concentrations of auxin solution on the growth of a certain plant organ. The growth rates are the same at concentrations m and n. Which of the following statements is correct? ( )
A. If i represents the auxin concentration on the lower side of the stem, then the stem can... | D | |
<image>The diagram shows a pedigree chart of a certain family. The shaded individuals in the chart indicate those from whom the corresponding genetic material cannot be extracted. To determine the parentage relationship between boy 9 and family members 6 and 7, the feasible identification plan is ( )
A. Compare the X c... | C | |
<image>The diagram illustrates the effect of environmental factors on the photosynthetic rate of corn. Based on this analysis, the incorrect statement is ( )
A. Before point M in the diagram, the main factor limiting the photosynthetic rate of corn is light intensity.
B. Compared to point b, the content of C<sub>3</s... | C | |
<image>In the diagram, Figure 1 represents the absorption and release curve of $$\ce{CO_{2}}$$ by a cotton plant over a day and night on a sunny day in August; Figure 2 shows four physiological activity states of two organelles in the mesophyll cells of cotton. Which physiological activities shown in Figure 2 occur seq... | D | |
<image>In butterflies, yellow body color $$(\text{C})$$ is dominant over white $$(\text{c})$$, and female individuals are white regardless of their genotype. The clubbed antennae trait is not sex-linked, meaning both males and females can have either clubbed antennae $$(\text{a})$$ or normal type $$(\text{A})$$. Based ... | C | |
<image>The diagram shows a model of a reflex arc. To verify that a certain drug can only block the transmission of excitation between neurons, but cannot block the conduction of excitation along nerve fibers, which of the following experimental operations is not necessary? ( )
A. Without the drug, stimulate at point ... | C | |
<image>The diagram below represents the process of haploid breeding in rice. The role of treating seedlings with colchicine is ( )
A. Increase mutation frequency
B. Cause the number of chromosomes in cells to double
C. Significantly improve certain traits
D. Obtain seedless fruits | B | |
<image>The diagram below shows the meiosis process of a fruit fly with the genotype E e X^{n} Y, where alleles E and e are located on chromosome 2. Cell c is a gamete with the genotype ee that does not contain sex chromosomes. Which of the following statements is correct? ( )
A. The cell in Diagram I has 8 chromosom... | D | |
<image>The diagram shows a concept map related to cell division. Which of the following statements is correct? ( )
A. There are no spindle fibers or chromosomes present during the process, and it only occurs in frog red blood cells.
B. In process 2, the number of chromosomes and nuclear DNA molecules exhibit a parall... | C | |
<image>Regarding the process shown in the diagram below, which statement is incorrect?
A. A is phosphate, which is the same in different nucleotides.
B. B is a pentose sugar, which is deoxyribose in DNA and ribose in RNA.
C. C is a nitrogenous base, and there are 5 types in the genetic material of the human body.
D. ... | C | |
<image>Carbon is one of the essential elements that make up living organisms. The diagram depicts the general process of the carbon cycle. Which of the following statements is incorrect? ( )
A. The food chain in the diagram consists of producers, II, and III
B. In the diagram, I represents the inorganic environment, an... | B | |
<image>The diagram below is a partial structural schematic of a certain reflex arc, where d is interstitial fluid. If neuron A is stimulated, an action potential can be detected on neuron C and the muscle contracts. Based on the diagram, determine which of the following statements is correct:
A. The structure shown i... | C | |
<image>Plasmids are commonly used as vectors in genetic engineering. The diagram below is a schematic representation of a natural soil Agrobacterium $$\ce{Ti}$$ plasmid structure (indicating some genes and some restriction enzyme sites). According to the diagram, which of the following statements is correct? ( )
A. T... | D | |
<image>Figure 1 is an electron micrograph of Drosophila DNA, where the bubble-like structures are called replication bubbles (the parts of DNA currently being replicated); Figure 2 is a schematic diagram of a replication bubble from Figure 1. Which of the following statements is incorrect? ( )
A. DNA replication occu... | D | |
<image>The diagram below represents some materials and apparatus used in the experiment for extraction and separation of pigments in green leaves. Which of the following statements is incorrect? ( )
A. In Figure 1, the substances added to the mortar include anhydrous ethanol, $$SiO_{2}$$, and $$CaCO_{3}$$.
B. When po... | D | |
<image>The diagram shows a pair of homologous chromosomes undergoing pairing during meiosis, with letters representing different genes. The type of variation shown in the diagram is ( )
A. Deletion
B. Duplication
C. Translocation
D. Inversion | D | |
<image>In the diagram, 1 and 2 represent variations occurring on autosomes. The types of variations represented by 1 and 2 are respectively ( )
A. Gene recombination and chromosomal translocation
B. Chromosomal translocation and chromosomal translocation
C. Chromosomal translocation and gene recombination
D. Gene rec... | A | |
<image>The diagram shows a cell division image of a mammal with the genotype AaBBdd during gamete formation. Which of the following statements is correct? ( )
A. The cell contains 6 chromatids, 6 DNA molecules, and 2 sets of chromosomes.
B. The cell can produce two different genotypes of mature gametes.
C. Gene mutat... | D | |
<image>The diagram illustrates the replication of DNA molecules and gene expression in eukaryotic cells. Which of the following statements is correct? ()
A. Process A mainly occurs in the nucleus, while processes B and C mainly occur in the cytoplasm.
B. Both processes A and B require the catalysis of DNA polymerase ... | C | |
<image>The diagram shows a schematic representation of a protein molecule. In the diagram, "▲, ★, ■, ●" represent different types of amino acids. Chain A consists of 21 amino acids, and Chain B consists of 19 amino acids. The "-S-S-" in the diagram is formed during protein processing by removing 2 H from two "-SH" grou... | C | |
<image>The compound that cannot undergo the hydrolysis reaction shown in the diagram is ( )
A. Nucleotide
B. Insulin
C. Salivary amylase
D. Glycogen | A | |
<image>As shown in Figures 1, 2, and 3, these represent substances that make up the cell membrane, and a, b, c represent three different ways substances enter and exit the cell. Which of the following statements is incorrect? ( )
A. The substance 3 on the cell membrane, like substance 2, also has both water-soluble and... | B | |
<image>The ATP synthase within the cell is mainly composed of two parts: the protein F<sub>0</sub> embedded in the membrane and the protein F<sub>1</sub> protruding outside the membrane. When H<sup>+</sup> passes through ATP synthase along the concentration gradient, it allows ADP and Pi to combine to form ATP, as show... | C | |
<image>Currently, by removing 2 alanines from a certain hexapeptide (positions as shown in the figure), several different organic products are obtained, with the removed amino acids existing in a free state. Which of the following statements about this process is correct? ( )
A. The number of peptide bonds decreases by... | D | |
<image>Which of the following statements about the diagram is correct? ( )
A. DD in diagram A, dd in diagram B, and Dd in diagram C are all the same genetic factors
B. The diagrams that correctly represent the essence of the law of segregation are A and B
C. Theoretically, diagram C can produce equal numbers of D and d... | C | |
<image>As shown in the image, a student is using a microscope. Based on the position of the microscope and the person, determine which step the student should complete next in the microscope operation ( )
A. Picking up the microscope
B. Placement
C. Lighting adjustment
D. Focusing and observation | B | |
<image>Research has found that early-onset Alzheimer's disease is closely associated with the apolipoprotein E (ApoE) gene. The ApoE gene is located on chromosome 19 and has three common alleles: ApoE2, ApoE3, and ApoE4. ApoE4 can inhibit the functions of ApoE2 and ApoE3, while also reducing the stability of neuronal c... | D | |
<image>Below is a diagram illustrating the absorption of water by plant root cells, where water moves from soil solution A$$\longrightarrow $$cell B$$\longrightarrow $$cell C$$\longrightarrow $$cell D. What is the concentration relationship between the cell sap of these three cells and the soil solution? ( ).
A. >B>C... | C | |
<image>The diagram shows a concept map related to cell division. Which of the following statements is correct? ( )
A. In the process, no spindle fibers or chromosomes appear, and DNA replication does not occur.
B. In the process, the number of chromosomes and nuclear DNA molecules are always equal.
C. The process hel... | C | |
<image>The diagram below shows the composition of a food web in a certain forest ecosystem. Which of the following statements is incorrect? ().
A. There are a total of 3 food chains in the diagram, and the fox occupies two trophic levels simultaneously.
B. When the number of pine caterpillars increases, the number of... | A | |
<image>According to the diagram, which of the following statements is incorrect? ( )
A. The pituitary gland can secrete thyrotropin-releasing hormone, directly regulating the secretion of hormones by the thyroid gland.
B. The pituitary gland can secrete thyroid-stimulating hormone, regulating the secretion of hormone... | A | |
<image>The diagram shows four genetic pedigree charts. Which of the following statements is correct? ( )
A. The inheritance patterns of pedigree A and B are exactly the same
B. In pedigree D, the probability of this couple having another daughter who is normal is $$1/8$$
C. In pedigree B, if the father carries the pa... | C | |
<image>CD47 is a transmembrane glycoprotein that can bind to signal regulatory proteins on the surface of macrophages, thereby inhibiting the phagocytic activity of macrophages. The amount of CD47 on the surface of various tumor cells, such as lung cancer and colon cancer, is 6-5 times higher than that of normal cells,... | D | |
<image>The diagram represents several physiological processes of a cell. Which of the following statements is incorrect? ( ).
A. 1. represents the process of cell growth
B. Different tissues are formed through 3.
C. 2. represents cell division, resulting in an increase in the number of cells
D. 3. leads to the doubli... | D | |
<image>The diagram shows the graph of photosynthesis intensity of a certain plant at 25°C as it changes with light intensity. Which of the following statements is correct? ( )
A. At point a, the physiological activity of mesophyll cells is only affected by temperature.
B. Point c is the light saturation point for this ... | C | |
<image>The diagram shows a schematic representation of the fluid mosaic model of the cell membrane. Which of the following statements is correct? ( )
A. a refers to the tail of the phospholipid molecule, which is hydrophilic
B. c refers to the non-polar head of the phospholipid molecule
C. The protein molecules that ma... | D | |
<image>As shown in the figure, an experiment was conducted on an isolated nerve fiber, selecting 4 points on the nerve fiber: a, b, c, and d, with bc < cd. Which of the following statements is correct? ( )
A. Stimulating point a, point d becomes excited first, then point b becomes excited
B. Stimulating point a can pro... | C | |
<image>The curve of the population growth multiplier λ (where λ represents the population size as a multiple of the previous year's population size) of a certain population over 13 years is shown in the figure. Which of the following analyses is correct? ( )
A. The population size remained unchanged for the first 4 y... | D | |
<image>The diagram shows a part of the regulation of water and salt balance in the human body. The incorrect statement is ( )
A. In the diagram, A, B, D, and E are the hypothalamus, pituitary gland, renal tubules and collecting ducts, and cerebral cortex, respectively.
B. C is antidiuretic hormone, which is secreted by... | C | |
<image>The diagram shows the secretion and action mechanism of female hormones in higher animals. A, B, and C represent organs, while a, b, d, and e represent substances. Processes 1, 2, and 3 are indicated. Based on the diagram, which of the following is incorrect? ( )
A. Female hormones are steroid substances that di... | D | |
<image>The diagram shows the process by which the flower color of a certain plant is controlled by two pairs of independently inherited genes, A/a and B/b, with one pair located on the X chromosome. A pure white-flowered female plant is crossed with a pure purple-flowered male plant to produce F<sub>1</sub>. Which of t... | C | |
<image>$$\ce{HIV}$$ can recognize $$\ce{T}$$ cells through $$\ce{CD_{4}}$$ (a receptor protein) on the cell surface (as shown in Figure A). If a large amount of red blood cells modified with $$\ce{CD_{4}}$$ is injected into an $$\ce{AIDS}$$ patient, the red blood cells will also be recognized and invaded by $$\ce{HIV}$... | B | |
<image>The color of a certain bird's feathers is controlled by alleles A and a, with more A alleles resulting in more melanin; alleles B and b control the distribution of pigment. Both pairs of genes are located on autosomes. Researchers conducted the hybridization experiment shown in the diagram. Which of the followin... | D | |
<image>As shown in the figure, a, b, and c are experiments with different treatments on coleoptiles, and d is a plant covered with a paper box, with one side of the box open, exposed to unilateral light. Which of the following descriptions of the experimental results is correct? ( )
A. a and b bend towards the light,... | D | |
<image>The diagram shows the relationship between the relative quantities of chromosomes and nuclear DNA during the process of mitosis. The cell may be in ( )
A. Prophase or Metaphase
B. Interphase or Telophase
C. Metaphase or Anaphase
D. Anaphase or Telophase | A | |
<image>In the construction of a new socialist countryside, a certain area in Sichuan has built a new agricultural ecosystem through the construction of biogas digesters and afforestation (as shown in the figure). Which of the following statements is correct? ( )
A. This new agricultural ecosystem is an ecosystem compos... | B | |
<image>Scientists isolated gene A from a certain organism and dissociated it into two single strands. One of these strands was hybridized with the messenger RNA of gene A, resulting in the pattern shown in the image. An unreasonable explanation for this is ( )
A. Positions 1, 3, 5, and 7 are connected through complem... | D | |
<image>In the human body, there is a gluconeogenesis pathway where non-carbohydrate substances are converted into glucose. It has been reported that scientists have discovered a key enzyme involved in gluconeogenesis, PEPCKI, whose process is shown in the diagram. Which of the following statements is incorrect? ( )
A... | B | |
<image>The diagram below shows a section of a myelinated nerve fiber. In the axon regions (b, d) wrapped by myelin sheath cells, $$Na^+$$ and $$K^+$$ cannot move in or out of the cell. In the exposed axon regions (a, c, e), $$Na^+$$ and $$K^+$$ can move in and out of the cell without restriction. Which of the following... | C | |
<image>The flower color of a certain plant is controlled by a pair of alleles. A plant with yellow flowers is crossed with a plant with white flowers (P), and the results are shown in the diagram. Which of the following statements is correct? ( )
A. Based on process 1, it can be concluded that the parents are both homo... | D | |
<image>The diagram shows a cell division schematic of an animal with the genotype AABb. Which of the following statements is incorrect? ( )
A. The gene a in this cell is formed due to crossing over during the prophase of the first meiotic division.
B. The gene a in this cell is produced by a mutation from gene A.
C. ... | A | |
<image>The changes in locust population numbers under different temperature and humidity conditions are shown in the following diagram. Which of the following statements is correct? ( )
A. At a temperature of 32.5 ℃, the range of humidity adaptation for locusts is the narrowest.
B. At a temperature of 35 ℃, a relati... | C | |
<image>In an experiment investigating the richness of small animal groups in soil, a biology group designed a device for collecting small animals as shown in the figure. Which of the following statements is correct? ( )
A. The device utilizes the phototaxis of soil animals.
B. The cover's function is to prevent insec... | D | |
<image>The diurnal distribution of two types of planktonic animals, A and B, in a certain sea area is shown in the figure. Which of the following analyses is reasonable? ( )
A. A is phototactic, B is photophobic
B. A and B mainly feed on phytoplankton
C. The distribution of B reflects the vertical structure of the comm... | D | |
<image>A certain interest group conducted an experiment on anaerobic respiration of yeast at room temperature (as shown in the figure). Which of the following is incorrect? ( )
A. The bubbles emerging from the dropper are $$\ce{CO2}$$ produced by the reaction.
B. The main purpose of adding water to the test tube is t... | D | |
<image>In an experiment where bacteriophages infect bacteria, the relationship between the incubation time of bacteriophages with bacteria and the intensity of radioactivity might be as follows. The most reasonable association among the following is (bacteriophages labeled with $$^{35}\text{S}$$ are referred to as Grou... | B | |
<image>The diagram below is a schematic of the reflex arc for the knee-jerk reflex. Which of the following statements is correct? ( )
A. In the knee-jerk reflex experiment, a small hammer should be used to tap the area indicated by $$5$$
B. In the knee-jerk reflex, the pathway of impulse conduction is $$5\rightarrow ... | C | |
<image>The diagram shows the distribution of three genes a, b, and c on a DNA molecule of a plant cell. In the diagram, I and II are sequences with no genetic effect. Which of the following statements is correct? ( )
A. The deletion of base pairs in a is a chromosomal structural variation.
B. If base pairs in c change,... | B | |
<image>The age structure of a certain population is shown in Figure A, and the growth curve is shown in Figure B. Which of the following statements is correct? ( )
A. The age structure in Figure A is expanding, and it is likely to belong to this age structure during period t<sub>2</sub>
B. The age structure in Figure A... | C | |
<image>"Locusts darken the sky, leaving no grass behind." The image shows the impact of several types of locusts, each individually, on the yield of pasture in the same grassland during a certain period. Which of the following analyses is incorrect? ( )
A. When population density is the same, the Asian migratory locust... | D | |
<image>The diagram shows a model of a certain cell structure. Which of the following statements about this cell is correct? ( )
A. The cell shown is a plant cell
B. The cell nucleus is not enclosed by a nuclear membrane
C. Contains ribosomes and various other organelles
D. Genetic material is in the form of chromosom... | B | |
<image>The sex chromosomes of male birds are ZZ, and those of female birds are ZW. In a certain bird species (2N=80), feather color is controlled by three genes located on the Z chromosome (as shown in the figure). D<sup>+</sup> controls gray-red color, D controls blue color, and d controls chocolate color. D<sup>+</su... | C | |
<image>After the invasion of the yellow-breasted rat into a certain mountainous area, it caused some harm to the ecosystem there. The relationship between the growth rate of its population and time (unit: year) is shown in the figure. Which of the following statements is correct? ()
A. The population size increased c... | A | |
<image>The pUC118 plasmid of Escherichia coli is a commonly used vector in genetic engineering, possessing an ampicillin resistance gene. The unique cleavage site of a certain restriction enzyme in this plasmid is located within the lacZ gene. On a specific selection medium, if the lacZ gene is not disrupted, the E. co... | B | |
<image>The following curves show two methods of acquiring immunity in the human body. Based on this, which of the following statements is correct? ( )
A. Method 2 is generally used in medicine for immunization prevention.
B. The process of acquiring antibodies using method 2 is called cellular immunity.
C. Using meth... | A | |
<image>Some scientists believe that when adult stem cells divide, they always allocate the chromosome with the relatively old DNA strand (immortal strand) to one of the daughter cells, making it an adult stem cell, and allocate the chromosome with the relatively new synthesized strand to the other daughter cell, allowi... | B | |
<image>Which of the following correctly reflects the effect of temperature on enzyme activity? ( )
A. C
B. B and C
C. A and D
D. C and D | A | |
<image>The diagram illustrates the relationships between population characteristics. Based on the diagram, which of the following statements is incorrect? ( )
A. 2, 3, and 4 represent age structure, birth and death rates, immigration and emigration rates, population size, and sex ratio, respectively.
B. The method co... | B | |
<image>The genotype of a certain higher animal is AaBb. The diagram below shows two cells at different stages during the meiosis of an oogonium. Which of the following statements is correct?
A. Cell A is in Anaphase I and contains 2 tetrads
B. Cell B represents a secondary oocyte containing 2 sets of chromosomes
C. G... | C | |
<image>The diagram shows the energy flow in an ecosystem, where N<sub>1</sub> to N<sub>6</sub> represent energy values. Which of the following statements is correct? ( )
A. The energy assimilated by dung beetles belongs to the second trophic level.
B. The total energy flowing through this ecosystem is N<sub>1</sub>.
... | D | |
<image>As shown in the figure, both poles of the galvanometer are connected to the outer surface of the nerve fiber membrane, with a and b representing stimulation points. Which of the following analyses is correct? ( )
A. When unstimulated, the potential measured by the galvanometer is the resting potential
B. When po... | B | |
<image>Some proteins in bacteria have disulfide bonds between their peptide chains. It is known that different peptide chains can be separated by electrophoresis due to differences in their relative molecular weights. As shown in Figure A, which is an electrophoresis result of bacterial proteins, '-' represents without... | B | |
<image>In the diagram, X, Y, and Z represent three endocrine glands in the human body, and A, B, and C represent the hormones they secrete. The arrows indicate the relationships between them. Which of the following statements is correct? ( )
A. If Y is removed, the weight of Z will not change.
B. X and Y are connected ... | D | |
<image>In a certain type of animal, black and white fur colors are a pair of contrasting traits, controlled by a pair of alleles located on an autosome. Black is dominant (W), and white is recessive (w). The diagram shows two mating events, where the parent animals A, B, P, and Q are all homozygous. The offspring anima... | C | |
<image>In the diagrams, both Figure A and Figure B represent the changes in the release of $$\ce{CO_{2}}$$ and the absorption of $$\ce{O}_{2}$$ by a non-green organ of a certain plant. Which of the following statements is incorrect? ( )
A. The situation in Figure A when the $$\ce{O}_{2}$$ concentration is $$a$$ corre... | B | |
<image>Figure A represents a series of changes in a chromosome (or chromatin) during the cell division process of a certain diploid organism. Figure B represents the related curves of the quantity of substances or structures during the cell division of this organism. Which of the following statements is correct? ( )
... | D | |
<image>Regarding the statements related to the four different organisms shown in the figure, which one is incorrect? ( )
A. Both organism A and B have a cell wall and a nucleoid
B. Organism C does not belong to the levels of organization in a biological system
C. The absorption of nutrients by organism D's cells refl... | C | |
<image>Changshun green-shell egg chicken (sex determination method ZW type) is a valuable resource in the mountainous areas of Guizhou. To explore the genetic inheritance pattern of shank color in green-shell egg chickens and the feasibility of using shank color to distinguish between sexes, breeders conducted the cros... | A | |
<image>Which of the following is not part of the 'protoplast' structure during plasmolysis in plant cells? ( )
A. Cell membrane
B. Tonoplast
C. Cytoplasm
D. Cell wall | D | |
<image>The diagram shows the relationship between enzyme activity and temperature. Which of the following statements is incorrect? ( )
A. t<sub>2</sub> is the optimal temperature for the enzyme.
B. When the reaction temperature is increased from t<sub>1</sub> to t<sub>2</sub>, enzyme activity will increase.
C. When the... | D | |
<image>Whether rabbits produce yellow fat or white fat in their bodies is determined by genetic factors. A breeding facility selected healthy yellow-fat rabbits and white-fat rabbits for research. Both types of rabbits were divided into two groups and fed different diets: one group was fed a diet containing yellow pigm... | D | |
<image>The diagram illustrates the actions of elbow flexion and elbow extension in humans. Which of the following statements is correct? ( )
A. During elbow flexion, 1. the biceps brachii relaxes, and 2. the triceps brachii contracts.
B. 3. represents the muscle belly of skeletal muscle, and 4. represents the tendon ... | C | |
<image>Which of the following statements about the diagram below is correct? ( )
A. The essence of the law of independent assortment is reflected in processes 4, 5, and 6 in the diagram.
B. Process 6 represents the process of meiosis.
C. The randomness of process 3 in Diagram A is one of the reasons why the proportio... | C |
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