Nitrogenase is a critical enzyme in the nitrogen cycle because it catalyzes the
A) assimilation of ammonia.
B) dissimilative reduction of nitrate to nitrogen gas.
C) fixation of nitrogen gas into ammonia.
D) oxidation of nitrogen gas into nitrate.
Answer: C
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A cell biologist examines a diploid cell from a particular species of during metaphase of mitosis and determines that 8 centromeres are present. Based on this finding, how many centromeres should be present in a single cell from this species during anaphase II of meiosis?
What will be an ideal response? Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you know about centromeres? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Adding helical turns to a closed-circular DNA:
A. will decrease the linking number. B. causes the formation of left-handed supercoils. C. causes the formation of negative supercoils. D. causes the formation of right-handed supercoils. E. does not affect the linking number.
Pinworms and hookworms are types of _______.
a) sponges b) arthropods c) nematodes d) cnidarians
Cells contain organized structures that perform a specific function. These are known as:
A) organelles. B) prokaryotes. C) organs. D) cytoplasm. E) tissues.