Ammonia-oxidizing bacteria play an essential role in the nitrogen cycle by ____
a. converting ammonia into nitrogen oxides
b. converting ammonia into nitrites
c. converting ammonia into ammonium
d. converting nitrites into ammonia
e. converting nitrites into nitrogen oxides
ANSWER: b
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________ is a process by which microorganisms or other particles are coated by serum components, preparing them for recognition and ingestion by phagocytic cells.
Fill in the blank(s) with the appropriate word(s).
You are studying a gene which, when mutant, causes oligodendrocytes to enwrap shorter sections of axon, so that nodes of Ranvier are more closely spaced. What is the likely effect on nerve impulses?
Nodes of Ranvier are the spaces between sections of axon enwrapped with myelin. Because myelin creates an insulating layer that prevents ion flow, the progress of the action potential "jumps" from node to node, thus speeding up transmission down the axon. A. They will travel faster. B. They will travel slower. C. They will increase in amplitude. D. They will decrease in amplitude. E. They will travel laterally across connected axons. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain? Gather Content/Choose Answer · What do you already know about nodes of Ranvier? How do they relate to nerve impulses? Consider Alternatives · What other information is related to the question? 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?
Which scenario illustrates directional selection?
a. Elk that are smaller or larger than average are easier prey for predators than elk of approximately average size. b. Bright feathers allow birds to attract mates, dull feathers hide birds from predators, but semi-bright feathers convey no advantage. c. Rabbits with shorter ears become more common where cattle that favor grazing on taller grass over shorter grass are introduced. d. Wildlife living in a forest are displaced after a wildfire destroys their natural habitat.
In which part of the brain contains the body’s
“thermostat”?
a. hypothalamus b. amygdala c. thalamus d. anterior pituitary gland e. medulla