1. Under the mosaic model, a cell _______ is a fluid. A.
1. Under the mosaic model...
1. Under the mosaic model, a cell _______ is a fluid.
Submitted: 11 years ago.Category: Homework
A. nucleus C. membrane
B. chloroplast D. vacuole
2. How is ATP formation driven during photosynthesis?
A. By the flow of oxygen molecules through the chloroplasts
B. By vacuoles pumping hydrogen ions into the cytoplasm, causing ATP formation
C. By hydrogen ions flowing from the thylakoid layer to the stroma in chloroplasts
D. By the breakdown of carbon monoxide and water
3. Why must transport proteins be located in the mitochondrial membrane to complete the third stage of aerobic respiration?
A. They drive the formation of the necessary coenzymes.
B. They allow heat energy to escape the mitochondrion.
C. They must interact with electrons and hydrogen.
D. They remove the used electrons from the transport system.
4. What controls the order in which different kinds of amino acids follow one another during the production of a polypeptide chain?
A. Enzymes C. DNA
B. Peptide bonds D. The type of hormone produced
5. How is an insect able to walk across the surface of a pond without sinking?
A. Due to the polarity of the water molecules
B. Due to the process of evaporation
C. Due to cohesion between the water molecules
D. Due to adhesion of the insect’s feet to the surface of the water
6. Observing a vacuole in a plant cell, you can be confident that it formed from several joined
A. vesicles. C. rough ER bodies.
B. lysosomes. D. smooth ER bodies.
7. The following atoms are all variations of the element carbon: 12C, 13C, and 14C. What are these variations called?
A. Radioisotopes C. Orbitals
B. Compounds D. Isotopes
8. A grassy meadow that’s home to rabbits, deer, and several species of birds would be
A. population. C. biosphere.
B. community. D. ecosystem.
9. If you immerse a living cell in a hypertonic solution, water will
A. move into the cell. C. move out of the cell.
B. remain constant. D. move out by active transport.
10. When does the light-independent Calvin-Benson cycle of photosynthesis cycle begin?
A. When carbon dioxide is attached to RuBP
B. When light isn’t available
C. When light is available
D. When electrons leave a photosystem
11. A molecule gives up an electron to another molecule which snaps it up.We must be
referring to a/an
A. illustration of entropy. C. electron transfer chain.
B. metabolic pathway. D. oxidation-reduction reaction.
12. Cellulose, starch, and glycogen are
A. proteins. C. polysaccharides.
B. monosaccharides. D. components of plant DNA.
13. Scientists have discovered three examples of a new type of atom with a fixed set of chemical properties. One example has three neutrons and the second has four neutrons,
but the third has only one neutron. What would the three examples be called?
A. Isotopes C. Elements
B. Molecules D. Variants
14. The second step in the scientific method is to
A. make predictions about expected outcomes.
B. develop a hypothesis, or educated guess.
C. develop a theory.
D. develop tests that produce actual observations.
15. Closing the stomata of a leaf keeps CO2 from entering. What would cause the stomata to close?
A. They close to prevent ATP from escaping.
B. They close to keep oxygen from flowing out of the leaf.
C. They close because photosynthesis isn’t taking place.
D. They close to conserve water.
16. Which of the following substances could you add to a solution if you wished to raise
A. Ammonia C. Coffee
B. Vinegar D. Lemon juice
17. Enzyme activity can be negatively affected by what environmental factors?
A. The presence of metal ions
B. Low salinity
C. Temperatures above certain tolerable limits
D. A pH value between 6 and 8
18. The atom with the simplest shell model is
A. carbon. C. hydrogen.
B. oxygen. D. calcium.
19. What are the three most common elements in your body?
A. Hydrogen, nitrogen, and oxygen
B. Oxygen, carbon dioxide, and water
C. Hydrogen, carbon, and oxygen
D. Water, carbon, and nitrogen
20. The evolution of photosynthesis occurred more than three billion years ago. What important effect did this have on the environment that led to the evolution of aerobic respiration?
A. It allowed for greater diversity of plant life as food for evolving heterotrophs.
B. It produced the water necessary for aerobic respiration to evolve.
C. The heat energy released from the pathway increased the Earth’s temperature.
D. The oxygen released as a byproduct changed the atmosphere.
21. Six carbons enter the second stage of aerobic respiration. How many depart during the preparation steps and the cycle proper?
A. 1 C. 6
B. 3 D. 9
22. Two simple sugars such as glucose and fructose interact to create a larger sucrose molecule. What type of reaction has occurred?
A. Condensation C. Electron transfer
B. Rearrangement D. Cleavage
23. Protists are included among
A. prokaryotes. C. eukaryotes.
B. archaea. D. bacteria.
24. What process moves solutes across cell membranes down their concentration gradients?
A. Passive transport C. Osmosis
B. Calcium pump D. Active transport
25. When a breeder prefers black coat color in his Labradors and therefore breeds only his dogs that have black coats, he’s participating in
A. artificial selection. C. natural selection.
B. evolution. D. adaptive selection.
1. During the transcription of a certain protein, an extra cytosine was placed into a gene region, throwing off the correct amino acid sequence. What type of mutation occurred?
C. Base-pair substitution
2. DNA requires which of the following?
A. Sunlight C. Protein synthase
B. Meiotic division D. Many enzymes
3. Why is there no duplication of the DNA between meiosis I and meiosis II?
A. To produce genetically identical daughter cells
B. To increase genetic variability
C. To reduce the chromosome number to haploid in the resulting daughter cells
D. The chromosomes duplicate twice during meiosis I.
4. The genetic disorder sickle-cell anemia is an example of
A. pleiotropy. C. epistasis.
B. heterozygous dominance. D. homozygous dominance.
5. What is the key difference between mitosis in plant cells and mitosis in animal cells?
A. The chromosomes aren’t duplicated during interphase in plant cells.
B. Animal cell mitosis results in two daughter cells; plant mitosis produces three.
C. The two daughter cells formed in plant cell mitosis aren’t genetically identical.
D. A cell plate is formed during mitosis in plant cells.
6. Which of the following genotypes causes Klinefelter syndrome?
A. XO C. XXY
B. XX D. XYY
7. In experiments with Drosophilia, _______ procedures have helped identify many gene functions.
A. pattern matching C. homeotic
B. knockout D. deleterious
8. When you notice that someone has unusually blue eyes, you’ve noticed their
A. phenotype. C. genotype.
B. allele. D. hybridization.
9. Why do researchers use DNA polymerase from a bacterium found in superheated water for PCR?
A. It’s the only bacterium that contains this enzyme.
B. It can withstand the elevated temperatures that are required to unwind DNA.
C. DNA must go through high-temperature sterilization before PCA can occur.
D. These bacteria contain more DNA polymerase than any other species.
10. Why are there so many possible combinations of maternal and paternal traits in each generation of offspring?
A. Because there are the same number of chromosomes in each cell
B. Because of the random grabbing of chromosomes by the microtubules during metaphase I
C. Because of the biological components that chromosomes are made of
D. Because of the high frequency of viral invasion
11. Which of the following most contributes to a large variation of traits inherited by an offspring?
A. Production of polar bodies
B. A small gene pool
C. Homozygous dominance
D. Random shuffling of homologous chromosomes in gamete production
12. Which of the following strands of DNA would be the complement strand to C-C-A-T-C-G?
A. G-G-T-A-G-C C. A-A-C-G-A-T
B. G-G-A-T-G-C D. T-T-G-C-T-A
13. Why are there more males with color blindness than females?
A. The gene for color blindness is found on the Y chromosome.
B. The recessive gene is usually masked by another X chromosome in females.
C. Color blindness is an X-linked dominant trait.
D. All the sons of an affected male will have the disorder.
14. Which of the following would have the same base sequencing in their DNA?
A. A male parent and his male offspring
C. Identical twins
D. A female parent and her offspring
15. Mitotic division produces two daughter cells with a _______ number of chromosomes, while meiosis produces four daughter cells with a _______ number of chromosomes.
A. haploid, diploid C. diploid, haploid
B. haploid, haploid D. diploid, diploid
16. A recessive allele t is responsible for a condition called distonia. A man who has this condition marries a woman who doesn’t. One of their four children has the condition. What are the possible genotypes of the man and woman?
A. The father is Tt; the mother is TT. C. Both parents are tt.
B. The father is tt; the mother is TT. D. The father is tt; the mother is Tt.
17. Suppose a cell’s membrane becomes more permeable than usual and loses some of its proteins. If the cytoskeleton shrinks and becomes disorganized, the cell is probably
B. ready to begin mitosis.
C. being engulfed by a phagocyte.
D. shutting down one of its X chromosomes as dosage compensation.
18. During meiosis, the chromatids become daughter chromosomes during which stage?
A. Prophase I C. Anaphase II
B. Metaphase II D. Telophase I
19. If you wanted to produce a certain protein in the laboratory, which of the following would be necessary for establishing the correct amino acid sequence?
A. Ribosomal proteins C. rRNA
B. mRNA D. Anticodons
20. The offspring of two parents that are heterozygous for a given trait have a _______
percent chance of being homozygous for that trait.
A. 0 C. 50
B. 25 D. 100
21. If a piece of DNA breaks off a chromosome and attaches itself to a nonhomologous chromosome at another location, what type of change has occurred?
A. Translocation C. Deletion
B. Duplication D. Inversion