Depolarization of the neuronal plasma membrane occurs due to ____

a. the diffusion of K+ into the cell
b. the diffusion of K+ out of the cell
c. the diffusion of Na+ into the cell.
d. the diffusion of Na+ out of the cell
e. closed gated channels


ANSWER: c

Biology & Microbiology

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__________ are regions rich in endemic species and

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Oxygen concentration generally plays an important role in regulating respiration:

a. all the time. b. never. c. only when the carbon dioxide concentration falls markedly. d. only when the oxygen concentration falls markedly. e. only when the pH falls markedly.

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This is the type of bonding characterized by sharing of electrons

What will be an ideal response?

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How can one distinguish between annuals, biennials, and perennials?

A. how tall they grow B. the time from seed germination to seed production C. the amount of root development D. the environment they grow in E. the number of flowers they produce

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