The all-or-none reaction means that:a
if a stimulus is strong enough, all axons in a nerve bundle will fire simultaneously.
b. a neuron will only produce an action potential if it has been depolarized to its threshold
level.
c. all neurons discharge impulses at the same frequency.
d. a neuron can create an action potential of varying intensities.
e. either all or none of the neurons will fire impulses when stimulat
B
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In a two-point cross to map genes A and B, you obtained 98 recombinant types and 902 parental types among the offspring. How far apart are these genes?
A. 9.8 cM B. 0.98 cM C. 90.2 cM D. 9.02 cM E. .098 cM 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 already know about two-point mapping? 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?
Which membrane protein is responsible for binding hormones that can trigger changes in the cell's activity?
a. recognition proteins b. receptor proteins c. transport proteins d. adhesion proteins e. channel proteins
Which phase of mitosis is a "preparatory" step involving the development of spindle microtubules?
A) Anaphase B) Prophase C) Metaphase D) Telophase
Biological rhythms in animals isolated from light and dark cues _____
A) continue to have cycles of exactly twenty-four hours' duration B) continue to have cycles of approximately twenty-four hours duration; some more rapid, some slower C) synchronize activity with whatever lighting cycle is imposed on them D) cease having any rhythms