questions stringlengths 37 1.22k | reasoning stringlengths 0 3.56k ⌀ | answers stringlengths 4 138 |
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The process of the cytoplasm splitting apart and the cell pinching in two is known as what?
Here are the choices:
A. cytokinesis
B. electrolysis
C. mitosis
D. budding | The cell wall grows toward the center of the cell. The cytoplasm splits apart, and the cell pinches in two. This is called cytokinesis . | A: cytokinesis. |
What kind of mountainous formation can often be found near trenches?
Here are the choices:
A. craters
B. volcanoes
C. earthquakes
D. caves | deep sea trenches : Trenches are found in the sea. Some are near the edges of continents. Trenches are found near chains of active volcanoes. An example is the line of the very deepest blue, off of western South America. | B: volcanoes. |
Because it can be controlled intentionally, skeletal muscle is also called what type of muscle?
Here are the choices:
A. involuntary
B. automatic
C. necessary
D. voluntary | Skeletal muscle tissue forms skeletal muscles, which attach to bones and sometimes the skin and control locomotion and any other movement that can be consciously controlled. Because it can be controlled intentionally, skeletal muscle is also called voluntary muscle. When viewed under a microscope, skeletal muscle tissu... | D: voluntary. |
What effect in the atmosphere ensures that the earth maintains the correct temperature to support life?
Here are the choices:
A. ozone effect
B. smog effect
C. greenhouse effect
D. coriolis effect | When sunlight heats Earth’s surface, some of the heat radiates back into the atmosphere. Some of this heat is absorbed by gases in the atmosphere. This is the greenhouse effect , and it helps to keep Earth warm. The greenhouse effect allows Earth to have temperatures that can support life. | C: greenhouse effect. |
Felsic, intermediate, mafic, and ultramafic are types of composition of what rock group?
Here are the choices:
A. metamorphic
B. Sedimentary
C. igneous
D. asteroids | Igneous rocks are classified by composition and texture. The composition can be felsic, intermediate, mafic, or ultramafic. The composition depends on the minerals the rock includes. A felsic rock will contain felsic minerals. | C: igneous. |
What is the base of nearly all food chains on earth?
Here are the choices:
A. synthesis
B. atherosclerosis
C. photosynthesis
D. glycolysis | Photosynthesis is the base of nearly all food chains on Earth. This is true of marine food chains, too. | C: photosynthesis. |
The skull is a part of a vertebrate endoskeleton that encloses and protects what organ?
Here are the choices:
A. nervous system
B. lung
C. brain
D. heart | part of a vertebrate endoskeleton that encloses and protects the brain; also called the skull. | C: brain. |
The global pattern of precipitation is influenced by movements of what?
Here are the choices:
A. air valleys
B. pollution masses
C. air masses
D. clouds | The global pattern of precipitation is influenced by movements of air masses. For example, there is a global belt of dry air masses and low precipitation at about 30° N and 30° S latitude. | C: air masses. |
What is the name of the region of a magnet that has the most pull?
Here are the choices:
A. pole
B. center
C. grid
D. tail | Imagine a huge bar magnet passing through Earth’s axis, as in the Figure below . This is a good representation of Earth as a magnet. Like a bar magnet, Earth has north and south magnetic poles. A magnetic pole is the north or south end of a magnet, where the magnet exerts the most force. | A: pole. |
How many major forces of elevation cause allele frequencies to change?
Here are the choices:
A. three
B. one
C. five
D. four | There are four major forces of evolution that cause allele frequencies to change. They are mutation, gene flow, genetic drift, and natural selection. | D: four. |
Where in the atom is a neutron found?
Here are the choices:
A. proton
B. the nucleus
C. orbit
D. electron | A neutron is one of three main particles that make up the atom. It is found in the nucleus and is neutral in electric charge. It has about the same mass and diameter as a proton. Neutrons are found in all atoms except for most atoms of hydrogen. | B: the nucleus. |
In physics, what is defined as the average kinetic energy of the particles of matter?
Here are the choices:
A. temperature
B. magnetism
C. density
D. friction | No doubt you already have a good idea of what temperature is. You might say that it’s how warm or cool something feels. In physics, temperature is defined as the average kinetic energy of the particles of matter. When particles of matter move more quickly, they have more kinetic energy, so their temperature is higher. ... | A: temperature. |
What organelles are known as the "power plants" of the cell?
Here are the choices:
A. mitochondria
B. flagella
C. golgi body
D. plastid | They have lots of mitochondria. Mitochondria are called the power plants of the cell, as these organelles are where most of the cell's energy is produced. Cells that need lots of energy have lots of mitochondria. | A: mitochondria. |
Dalton's law and henry's law both describe aspects of what type of exchange?
Here are the choices:
A. energy
B. liquid
C. electron
D. gas | 22.4 Gas Exchange The behavior of gases can be explained by the principles of Dalton’s law and Henry’s law, both of which describe aspects of gas exchange. Dalton’s law states that each specific gas in a mixture of gases exerts force (its partial pressure) independently of the other gases in the mixture. Henry’s law st... | D: gas. |
What vesicles store neurotransmitters?
Here are the choices:
A. synaptic
B. dendritic
C. Golgi apparatus
D. hydrophobic | Secretory Vesicles contain materials that are to be excreted from the cell, such as wastes or hormones . Secretory vesicles include synaptic vesicles and vesicles in endocrine tissues. Synaptic vesicles store neurotransmitters. They are located at presynaptic terminals in neurons. When a signal reaches the end of an ax... | A: synaptic. |
What temperature scale is obtained by adding 273 degrees from the corresponding celsius temperature?
Here are the choices:
A. seismic scale
B. ph scale
C. whittle scale
D. kelvin scale | The Celsius scale is the standard SI temperature scale. It is equal to the Kelvin scale if you minus 273 from the Celsius reading. Water has a boiling point of and a freezing point of . | D: kelvin scale. |
Hemoglobin is a large molecule made up of proteins and iron. it consists of four folded chains of a protein called this?
Here are the choices:
A. insulin
B. peptide
C. globin
D. histone | Hemoglobin Hemoglobin is a large molecule made up of proteins and iron. It consists of four folded chains of a protein called globin, designated alpha 1 and 2, and beta 1 and 2 (Figure 18.7a). Each of these globin molecules is bound to a red pigment molecule called heme, which contains an ion of iron (Fe2+) (Figure 18.... | C: globin. |
A new species is said to have evolved if separated members of a species evolve genetic differences that prevent what from occurring with the original members??
Here are the choices:
A. re-population
B. interbreeding
C. extinction
D. evolution | Assume that some members of a species become geographically separated from the rest of the species. If they remain separated long enough, they may evolve genetic differences. If the differences prevent them from interbreeding with members of the original species, they have evolved into a new species. Speciation that oc... | B: interbreeding. |
What term describes the orientation of a body lying face-down?
Here are the choices:
A. prone
B. Under
C. Diagnal
D. Supine | A body that is lying down is described as either prone or supine. Prone describes a face-down orientation, and supine describes a face up orientation. These terms are sometimes used in describing the position of the body during specific physical examinations or surgical procedures. | A: prone. |
What happens to energy when an atom gains an electron?
Here are the choices:
A. it increases
B. it is used
C. it is folded
D. it is released | A: Energy is released when an atom gains an electron. Halogens release the most energy when they form ions. As a result, they are very reactive elements. | D: it is released. |
What is the name of the second most electronegative element?
Here are the choices:
A. Hydrogen
B. oxygen
C. carbon
D. nitrogen | Oxygen has an oxidation state of -2 in most of its compounds. Oxygen is the second most electronegative element, so it also tends to be assigned all shared electrons. Exceptions include O 2 (oxidation state = 0), peroxides, in which two oxygen atoms are connected by a single bond (oxidation state usually = -1), and any... | B: oxygen. |
What is the term for species evolving together?
Here are the choices:
A. coevolution
B. interconnection
C. specmutation
D. conjuration | Coevolution occurs when species evolve together. This often happens in species that have symbiotic relationships. Examples include flowering plants and their pollinators. | A: coevolution. |
Where do the eggs develop?
Here are the choices:
A. the ovaries
B. the uterus
C. the glands
D. the follicles | A: the ovaries. | |
What's the other term for your wind pipe?
Here are the choices:
A. trachea
B. cornea
C. cochlea
D. esophagus | The trachea , or wind pipe, is a long tube that leads down to the chest. | A: trachea. |
When food is scarce, starving cells secrete a molecule that stimulates neighboring cells to do what?
Here are the choices:
A. die off
B. aggregate
C. compete
D. hoard energy | B: aggregate. | |
What do cells secrete that binds to receptors?
Here are the choices:
A. proteins
B. stress
C. endorphans
D. factor | D: factor. | |
What is the term for the tube that carries sound waves into the ear?
Here are the choices:
A. flap canal
B. sound canal
C. ear canal
D. tone canal | The ear canal is a tube that carries sound waves into the ear. The sound waves travel through the air inside the ear canal to the eardrum. | C: ear canal. |
In the cardiovascular system, what blood vessels carry blood away from the heart?
Here are the choices:
A. capillaries
B. veins
C. arteries
D. cilia | The blood vessels are an important part of the cardiovascular system. They connect the heart to every cell in the body. Arteries carry blood away from the heart, while veins return blood to the heart ( Figure below ). | C: arteries. |
Molecules in the gas phase can collide with the liquid surface and reenter the liquid via what?
Here are the choices:
A. liquidation
B. combustion
C. condensation
D. fermentation | pressure above the liquid. Molecules in the gas phase can collide with the liquid surface and reenter the liquid via condensation. Eventually, a steady state is reached in which the number of molecules evaporating and condensing per unit time is the same, and the system is in a state of dynamic equilibrium. Under these... | C: condensation. |
What guards the opening between the right atrium and the right ventricle?
Here are the choices:
A. brachiocephalic trunk
B. superior vena cava
C. aorta
D. tricuspid valve | Right Atrium The right atrium serves as the receiving chamber for blood returning to the heart from the systemic circulation. The two major systemic veins, the superior and inferior venae cavae, and the large coronary vein called the coronary sinus that drains the heart myocardium empty into the right atrium. The super... | D: tricuspid valve. |
The water cycle involves movement of water between air and what?
Here are the choices:
A. animals
B. tree
C. land
D. air | C: land. | |
When we consider a chemical reaction, we need to take into account both the system and what?
Here are the choices:
A. time
B. date
C. fluctuations
D. sorroundings | When we consider a chemical reaction, we need to take into account both the system and the surroundings. The system includes the components involved in the chemical reaction itself. These will often take place in a flask, a beaker, a test tube, or some other container. The surroundings include everything that is not pa... | D: sorroundings. |
What is a layer of tissue that lies between the shell and the body?
Here are the choices:
A. mantle
B. stem
C. node
D. silt | Two unique features of mollusks are the mantle and radula (see Figure above ). The mantle is a layer of tissue that lies between the shell and the body. It secretes calcium carbonate to form the shell. It forms a cavity, called the mantle cavity, between the mantle and the body. The mantle cavity pumps water for filter... | A: mantle. |
In what country can some of the largest natural crystals be found?
Here are the choices:
A. germany
B. canada
C. mexico
D. spain | Some of the largest, and most beautiful, natural crystals can be found in the Naica mine, in Mexico. These gypsum crystals were formed over thousands of years. Groundwater that is rich in calcium and sulfur flowed through an underground cave. Check it out:. | C: mexico. |
What are the primary producers in terrestrial biomes?
Here are the choices:
A. plants
B. gases
C. animals
D. soil | Plants are the primary producers in terrestrial biomes. They make food for themselves and other organisms by photosynthesis. The major plants in a given biome, in turn, help determine the types of animals and other organisms that can live there. | A: plants. |
Where are aerofoils found?
Here are the choices:
A. birds and cars
B. airplanes and plants
C. birds and airplanes
D. birds and busses | Birds also have wings that function as an aerofoil . The surface of the aerofoil is curved to help the bird control and use the air currents to fly. Aerofoils are also found on the wings of airplanes. | C: birds and airplanes. |
What is the si unit for pressure?
Here are the choices:
A. watt
B. pascal
C. le
D. laurent | Summary Four quantities must be known for a complete physical description of a sample of a gas: temperature, volume, amount, and pressure. Pressure is force per unit area of surface; the SI unit for pressure is the pascal (Pa), defined as 1 newton per square meter (N/m2). The pressure exerted by an object is proportion... | B: pascal. |
Marine fishes take in divalent ions by incessantly drinking what?
Here are the choices:
A. sand
B. algae
C. oxygen
D. seawater | D: seawater. | |
The simplest and smallest particle of matter that still has chemical properties of the element is called?
Here are the choices:
A. an isotope
B. an atom
C. a nucleus
D. a molecule | Inside of elements, you will find identical atoms. An atom is the simplest and smallest particle of matter that still has chemical properties of the element. Atoms are the building block of all of the elements that make up the matter in your body or any other living or non-living thing. Atoms are so small that only the... | B: an atom. |
Frequency and intensity are two measurable properties of what?
Here are the choices:
A. lines
B. heat
C. wave
D. troughs | All waves can be defined in terms of their frequency and intensity. | C: wave. |
While most mammals give birth to live young, monotremes can do what?
Here are the choices:
A. adopt offspring
B. steal eggs
C. reproduce asexually
D. lay eggs | Monotremes can lay eggs, but most mammals give birth to live young. | D: lay eggs. |
What happens to old oceanic crust at convergent boundaries?
Here are the choices:
A. destroyed
B. dissolves
C. created
D. emerges | It’s much easier to precisely make mirrors than to precisely make glass lenses. For that reason, reflectors can be made larger than refractors. Larger telescopes can collect more light. This means that they can study dimmer or more distant objects. The largest optical telescopes in the world today are reflectors. Teles... | A: destroyed. |
When electrons are shared between two atoms, they make a bond called a what?
Here are the choices:
A. metallic bond
B. covalent bond
C. ionic bond
D. hydrogen bond | Ionic bonding typically occurs when it is easy for one atom to lose one or more electrons and another atom to gain one or more electrons. However, some atoms won’t give up or gain electrons easily. Yet they still participate in compound formation. How? There is another mechanism for obtaining a complete valence shell: ... | B: covalent bond. |
What happens to the temperature of matter as light is absorbed?
Here are the choices:
A. it drops
B. it increases
C. it triples
D. it stays the same | http://www. chem. ufl. edu/~itl/2045/lectures/lec_d. html. | B: it increases. |
By shocking ocean water, earthquakes can cause what deadly ocean waves?
Here are the choices:
A. deep currents
B. typhoons
C. ebb tides
D. tsunamis | Earthquakes can cause tsunamis . These deadly ocean waves may result from any shock to ocean water. A shock could be a meteorite impact, landslide, or a nuclear explosion. But most come from large underwater earthquakes. | D: tsunamis. |
Where are the desmosome found in a cell?
Here are the choices:
A. epithelium
B. neuron
C. epithelial
D. coating | A desmosome is a cell junction specialized for cell-to-cell adhesion. They are found in simple and stratified squamous epithelium, and in muscle tissue where they bind muscle cells to one another. These junctions are composed of complexes of cell surface adhesion proteins and linking proteins. These proteins have both ... | A: epithelium. |
An action potential that starts at the axon hillock moves along the axon only toward what?
Here are the choices:
A. nerve endings
B. ionic pathways
C. the synaptic terminals
D. polar synapses | C: the synaptic terminals. | |
Fission is a type of radioactivity in which large nuclei spontaneously break apart into what?
Here are the choices:
A. light nuclei
B. smaller nuclei
C. active nuclei
D. faster nuclei | Fission is a type of radioactivity in which large nuclei spontaneously break apart into smaller nuclei. | B: smaller nuclei. |
Bones are the main organs of what system, which also includes cartilage and ligaments?
Here are the choices:
A. skeletal system
B. lymphatic system
C. digestive system
D. endocrine system | Bones are the main organs of the skeletal system. The skeletal system also includes cartilage and ligaments. | A: skeletal system. |
Most waves strike the shore at an angle. this causes what?
Here are the choices:
A. tide
B. erosion
C. longshore drift
D. fontaine drift | Below the topsoil is the “B“ horizon. This is also called the subsoil . Soluble minerals and clays accumulate in the subsoil. Because it has less organic material, this layer is lighter brown in color than topsoil. It also holds more water due to the presence of iron and clay. There is less organic material in this lay... | C: longshore drift. |
What is the difference between the daily high and the daily low?
Here are the choices:
A. margin of error
B. weather forecast
C. tidal change
D. sunrise and sunset | The difference between the daily high and the daily low is the tidal range. | C: tidal change. |
Spermatogonia are the stem cells of what male sex organs?
Here are the choices:
A. Prostate
B. Epididymis
C. testes
D. ovaries | Germ Cells The least mature cells, the spermatogonia (singular = spermatogonium), line the basement membrane inside the tubule. Spermatogonia are the stem cells of the testis, which means that they are still able to differentiate into a variety of different cell types throughout adulthood. Spermatogonia divide to produ... | C: testes. |
Sensory neurons transmit nerve impulses from sense organs and internal organs to the brain via the?
Here are the choices:
A. spinal column
B. spinal cord
C. nervous system
D. nerve endings | Sensory neurons transmit nerve impulses from sense organs and internal organs to the brain via the spinal cord. In other words, they carry information about the inside and outside environment to the brain. | B: spinal cord. |
Sexually reproducing organisms alternate between which stages?
Here are the choices:
A. binary and diploid
B. binary and haploid
C. diploid and traploid
D. haploid and diploid | CHAPTER SUMMARY 7.1 Sexual Reproduction Nearly all eukaryotes undergo sexual reproduction. The variation introduced into the reproductive cells by meiosis appears to be one of the advantages of sexual reproduction that has made it so successful. Meiosis and fertilization alternate in sexual life cycles. The process of ... | D: haploid and diploid. |
Acids turn blue litmus paper which color?
Here are the choices:
A. white
B. grey
C. purple
D. red | Certain indicator compounds, such as litmus, can be used to detect acids. Acids turn blue litmus paper red. | D: red. |
The development of a head region is called what?
Here are the choices:
A. cephalization
B. cocklebur
C. spore
D. trichina | Most flatworms have a distinct head region that includes nerve cells and sensory organs, such as eyespots. The development of a head region, called cephalization , evolved at the same time as bilateral symmetry in animals. This process does not occur in cnidarians, which evolved prior to flatworms and have radial symme... | A: cephalization. |
Which hormone helps cells absorb sugar from the blood?
Here are the choices:
A. estrogen
B. insulin
C. adrenaline
D. cortisol | Endocrine system: A high concentration of sugar in the blood triggers secretion of insulin by an endocrine gland called the pancreas. Insulin is a hormone that helps cells absorb sugar from the blood. | B: insulin. |
What is the number of electrons equal to in every electrically neutral atom?
Here are the choices:
A. protons
B. nucleus
C. molecules
D. Electrons | Electron Shells and the Bohr Model It should be stressed that there is a connection between the number of protons in an element, the atomic number that distinguishes one element from another, and the number of electrons it has. In all electrically neutral atoms, the number of electrons is the same as the number of prot... | A: protons. |
Does climate change have a positive or negative effect on reproductive success?
Here are the choices:
A. neither
B. negative
C. positive
D. both | B: negative. | |
What is the most common form of dwarfism in humans?
Here are the choices:
A. anemia
B. alopecia
C. malnutrition
D. achondroplasia | It can be. Achondroplasia is the most common form of dwarfism in humans, and it is caused by a dominant mutation. The mutation can be passed from one generation to the next. Over 95% of unrelated individuals with Achondroplasia have the same mutation, making it one of the most common mutations in the human genome. Why?... | D: achondroplasia. |
What is the term for groups of three successive nucleotide bases in dna?
Here are the choices:
A. triads
B. tertiary bases
C. triple play
D. triplets | Overview of Transcription. Transcription uses the sequence of bases in a strand of DNA to make a complementary strand of mRNA. Triplets are groups of three successive nucleotide bases in DNA. Codons are complementary groups of bases in mRNA. | D: triplets. |
The coccyx, or tailbone, results from the fusion of four small what?
Here are the choices:
A. coccygeal vertebrae
B. rib vertebrae
C. alangulam vertebrae
D. arsine vertebrae | Regions of the Vertebral Column The vertebral column originally develops as a series of 33 vertebrae, but this number is eventually reduced to 24 vertebrae, plus the sacrum and coccyx. The vertebral column is subdivided into five regions, with the vertebrae in each area named for that region and numbered in descending ... | A: coccygeal vertebrae. |
What is a pure substance that cannot be separated into any other substances called?
Here are the choices:
A. Cells
B. Spears
C. element
D. light | An element is a pure substance that cannot be separated into any other substances. There are 92 naturally occurring elements. | C: element. |
How many different types of stresses are there?
Here are the choices:
A. three
B. five
C. seven
D. four | Stress is the force applied to a rock. There are four types of stresses:. | D: four. |
A molecule has two structures that can be generated. what is this called?
Here are the choices:
A. resonance hybrids
B. ethnocentrism
C. congruence
D. isomerism | The cis isomer has the two single hydrogen atoms on the same side of the molecule, while the trans isomer has them on opposite sides of the molecule. In both molecules, the bonding order of the atoms is the same. In order for geometric isomers to exist, there must be a rigid structure in the molecule to prevent free ro... | D: isomerism. |
An antigen is a molecule that reacts with some component of the what response?
Here are the choices:
A. digestion
B. immune
C. hormones
D. fight or flight | Chapter 42 1 Figure 42.11 C 3 Figure 42.16 If the blood of the mother and fetus mixes, memory cells that recognize the Rh antigen can form late in the first pregnancy. During subsequent pregnancies, these memory cells launch an immune attack on the fetal blood cells. Injection of anti-Rh antibody during the first pregn... | B: immune. |
What bodily system is primarily responsible for fighting pathogens in the body?
Here are the choices:
A. immune
B. Muscular
C. digestion
D. Cardiovascular | 21.5 | The Immune Response against Pathogens By the end of this section, you will be able to: • Explain the development of immunological competence • Describe the mucosal immune response • Discuss immune responses against bacterial, viral, fungal, and animal pathogens • Describe different ways pathogens evade immune re... | A: immune. |
Displacement, velocity, acceleration, and force are examples of what type of quantity that has magnitude and direction?
Here are the choices:
A. vector
B. wave
C. frequency
D. cycles | Vectors in Two Dimensions A vector is a quantity that has magnitude and direction. Displacement, velocity, acceleration, and force, for example, are all vectors. In one-dimensional, or straight-line, motion, the direction of a vector can be given simply by a plus or minus sign. In two dimensions (2-d), however, we spec... | A: vector. |
Gases such as co2 and methane can trap what energy in earth's atmosphere, before radiating it into space?
Here are the choices:
A. mechanical energy
B. sunlight energy
C. thermal energy
D. potential energy | Thermal energy can be trapped in Earth’s atmosphere by gases such as CO2, water vapor, methane, and chlorofluorocarbons before it can be radiated into space—like the effect of a greenhouse. It is not yet clear how large an increase in the temperature of Earth’s surface can be attributed to this phenomenon. Venus is an ... | C: thermal energy. |
What happens when heated water is released into a body of water?
Here are the choices:
A. gaseous pollution
B. thermal pollution
C. geysers
D. crystalline pollution | If heated water is released into a body of water, it may cause thermal pollution. Thermal pollution is a reduction in the quality of water because of an increase in water temperature. A common cause of thermal pollution is the use of water as a coolant by power plants and factories. This water is heated and then return... | B: thermal pollution. |
What term is used to describe a chemical released by an animal that affects the behavior or physiology of animals of the same species?
Here are the choices:
A. amino
B. isolate
C. enzyme
D. pheromone | The amount of material left over after a certain number of half-lives can be easily calculated. | D: pheromone. |
Producers at the base of ecological food webs are also known as?
Here are the choices:
A. autotrophic
B. mutualistic
C. symbiotic
D. endoscopic | A: autotrophic. | |
What is the term for the gas in smog that can damage plants?
Here are the choices:
A. dioxide
B. sulphur
C. carbon
D. ozone | The ozone in smog may damage plants. The effects of ozone add up over time. Plants such as trees, which normally live a long time, are most affected. Entire forests may die out if ozone levels are very high. Other plants, including crop plants, may also be damaged by ozone. You can see evidence of ozone damage in Figur... | D: ozone. |
What must happen for two ions to form an ionic bond?
Here are the choices:
A. Two ions need to be the same size
B. two ions need to have neutral charges
C. two ions need to have opposite charges
D. two ions need to have the same charge | C: two ions need to have opposite charges. | |
What is the study of the similarities and differences in the embryos of different species?
Here are the choices:
A. diversified embryology
B. prenatal biology
C. example embryology
D. comparative embryology | Comparative embryology is the study of the similarities and differences in the embryos of different species. Similarities in embryos are evidence of common ancestry. All vertebrate embryos, for example, have gill slits and tails. Most vertebrates, except for fish, lose their gill slits by adulthood. Some of them also l... | D: comparative embryology. |
What are the main organs of the respiratory system?
Here are the choices:
A. ovaries
B. intestines
C. lungs
D. kidneys | The lungs are the main organs of the respiratory system. This is where gases are exchanged between the air and the blood. Gases are also transported by the blood and exchanged between the blood and all the cells of the body. | C: lungs. |
What do you call the traits that allow a plant, animal, or other organism to survive and reproduce in its environment?
Here are the choices:
A. settings
B. adaptations
C. additions
D. advantages | Every plant and animal depends on its traits to survive. Survival may include getting food, building homes, and attracting mates. Traits that allow a plant, animal, or other organism to survive and reproduce in its environment are called adaptations . | B: adaptations. |
The products of photosynthesis are glucose and what else?
Here are the choices:
A. carbon
B. oxygen
C. hydrogen
D. nitrogen | The products of photosynthesis are glucose and oxygen. | B: oxygen. |
In what way do bacteria reproduce?
Here are the choices:
A. binary fission
B. cellular respiration
C. sexual reproduction
D. fragmentation | Bacteria reproduce by binary fission, resulting in two daughter cells identical to the parent cell. | A: binary fission. |
What type of fibers are made mostly of protein in living things?
Here are the choices:
A. organ fibers
B. muscle fibers
C. liver fibers
D. connective tissue fibers | Muscle fibers are made mostly of protein. | B: muscle fibers. |
What force is responsible for erosion by flowing water and glaciers?
Here are the choices:
A. kinetic
B. weight
C. electromagnetic
D. gravity | Gravity is responsible for erosion by flowing water and glaciers. That’s because gravity pulls water and ice downhill. These are ways gravity causes erosion indirectly. But gravity also causes erosion directly. Gravity can pull soil, mud, and rocks down cliffs and hillsides. This type of erosion and deposition is calle... | D: gravity. |
Nearly all protists exist in some type of aquatic environment, including freshwater and marine environments, damp soil, and even snow. several protist species are parasites that infect animals or plants. a few protist species live on dead organisms or their wastes, and contribute to what?
Here are the choices:
A. spont... | Habitats Nearly all protists exist in some type of aquatic environment, including freshwater and marine environments, damp soil, and even snow. Several protist species are parasites that infect animals or plants. A few protist species live on dead organisms or their wastes, and contribute to their decay. | C: their decay. |
What type of rocks form from cooled magma or lava?
Here are the choices:
A. metamorphic
B. sedementary
C. igneous
D. granite | Igneous rocks form from cooled magma or lava. | C: igneous. |
What kind of cells have positive cell potentials, and all the reduction reactions are reversible?
Here are the choices:
A. inhibited cells
B. galvanic cells
C. neutral cells
D. new cells | Galvanic cells have positive cell potentials, and all the reduction reactions are reversible. The reaction at the anode will be the half-reaction with the smaller or more negative standard reduction potential. Reversing the reaction at the anode (to show the oxidation) but not its standard reduction potential gives: An... | B: galvanic cells. |
A fish's stream-lined body that reduces water resistance is an example of what kind of response to an aquatic lifestyle?
Here are the choices:
A. natural selection
B. adaptation
C. evolution
D. retraction | Many structures in fish are adaptations for their aquatic lifestyle. For example, fish have a stream-lined body that reduces water resistance while swimming. | B: adaptation. |
Emissions of what gas into the atmosphere from fossil fuel burning have been rising for the past several decades?
Here are the choices:
A. neon
B. carbon dioxide
C. sulphur
D. oxygen | Carbon dioxide emissions into the atmosphere from fossil fuel burning have been rising for the past several decades. | B: carbon dioxide. |
Gymnosperms have seeds but do not have what?
Here are the choices:
A. leaves
B. flowers
C. roots
D. stems | Gymnosperms have seeds but do not have flowers. | B: flowers. |
Modern members of what broad animal group live in many different habitats and are found on every continent except antarctica?
Here are the choices:
A. reptiles
B. arachnids
C. amphibians
D. parasites | Modern reptiles live in many different habitats. They can be found on every continent except Antarctica. | A: reptiles. |
The right ventricle pumps what type of blood toward the lungs?
Here are the choices:
A. oxygen-poor
B. oxygenated
C. oxygen-rich
D. plasma | The right ventricle pumps oxygen-poor blood toward the lungs, where it receives oxygen. | A: oxygen-poor. |
Some 96% of the dry mass consists of organic compounds produced by what?
Here are the choices:
A. reproduction
B. erosion
C. photosynthesis
D. electrolysis | C: photosynthesis. | |
What is it called when something is unable to move from place to place?
Here are the choices:
A. obovate
B. sessile
C. Undrate
D. ovate | Sponges come in a variety of shapes and sizes. For example, they may be shaped like tubes, fans, cones, or just blobs. They range in diameter from about a centimeter (0.4 inches) to over a meter (3.3 feet). Many species live in colonies that may be quite large. Adult sponges are sessile . This means they are unable to ... | B: sessile. |
What waves are the broad range of electromagnetic waves with the longest wavelengths and lowest frequencies?
Here are the choices:
A. sound
B. light
C. radio
D. microwaves | Radio waves are the broad range of electromagnetic waves with the longest wavelengths and lowest frequencies. They are used for radio and television broadcasts, microwave ovens, cell phone transmissions, and radar. | C: radio. |
What are the two main types of sedimentary rocks?
Here are the choices:
A. clastic and chemical
B. shale and limestone
C. basalt and dolomite
D. sandstone and shale | There are two main types of sedimentary rocks: clastic and chemical. Clastic rocks are made of sediments, which are sometimes called clasts. Creating rocks from sediments is called lithification . Chemicals precipitate from liquid to form chemical sedimentary rocks. | A: clastic and chemical. |
Light waves which interfere with themselves after interaction with a small aperture or target are said to what?
Here are the choices:
A. diffract
B. reflect
C. adduce
D. refract | Waves are characterized by their ability to constructively and destructively interfere . Light waves which interfere with themselves after interaction with a small aperture or target are said to diffract . | A: diffract. |
Distance traveled divided by time yields what measurement, which is another word used to describe the speed of a chemical reaction?
Here are the choices:
A. rate
B. flow
C. displacement
D. acceleration | Chemists need to be concerned with the rates at which chemical reactions occur. Rate is another word for speed. If a sprinter takes 11.0 s to run a 100 m dash, his rate or speed is given by the distance traveled divided by the time. | A: rate. |
Beryllium, magnesium, calcium, strontium, and barium are classified as what type of metals?
Here are the choices:
A. acid earth metals
B. alkaline aligned metals
C. alkaline support metals
D. alkaline earth metals | The alkaline earth metals include beryllium, magnesium, calcium, strontium, and barium. Strontium and barium react with air and must be stored in oil. | D: alkaline earth metals. |
Common among mammals and insects, pheromones are often related to what type of behavior?
Here are the choices:
A. cardiac
B. aggressive
C. immune
D. reproductive | D: reproductive. | |
Neutron stars are the corpses of left over what?
Here are the choices:
A. gravitational explosions
B. stellar explosions
C. planet explosions
D. supernova explosions | Neutron stars are the corpses of stars left over after supernova explosions. They are the size of a small city, but can spin several times per second. (Try to imagine this in your head. ) Consider a neutron star of radius 10 km that spins with a period of 0.8 seconds. Imagine a person is standing at the equator of this... | D: supernova explosions. |
In recent years, however, researchers have discovered that microsporidia actually have tiny organelles derived from what?
Here are the choices:
A. proteins
B. mitochondria
C. plasma
D. carbohydrates | B: mitochondria. | |
The negative logarithm of the hydroxide-ion concentration of a solution is called?
Here are the choices:
A. the piel
B. the poh
C. the hil
D. the hop | As with the hydrogen-ion concentration, the concentration of the hydroxide ion can be expressed logarithmically by the pOH. The pOH of a solution is the negative logarithm of the hydroxide-ion concentration. | B: the poh. |
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