Repolarization of the membrane during an action potential is primarily due to _________.

a. Closing of K+ channels
b. Opening of K+ channels
c. Opening of Cl- channels
d. Opening of Na+ channels


Answer: b. Opening of K+ channels

Biology & Microbiology

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Which is a false statement regarding riboswitches?

A. Riboswitches are regions in the 5' untranslated leader of an mRNA. B. When the effector binds the riboswitch, it may serve to terminate transcription of its target mRNA. C. When the effector binds the riboswitch, it may serve to continue transcription of its target mRNA. D. The effector molecules that bind to riboswitches are proteins.

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A possible negative consequence of personalized medicine could be

A. predicting responses to medications. B. incorrect predictions of sequence motifs. C. difficulty obtaining insurance if susceptibility to disease becomes public information. D. tailoring treatments to an individual. E. None of the answer options represent negative consequences of personalized medicine.

Biology & Microbiology

If the figure 5 above shows realized niches, this is a strong example of

A) competitive exclusion B) character displacement C) niche partitioning by seed size D) resource competition for certain seed sizes E) resource competition for the largest seed size

Biology & Microbiology

The thymus produces ________, a hormone that stimulates the maturation of specialized white blood cells called T cells

A) testosterone B) thyroxine C) ACTH D) thymosin E) insulin

Biology & Microbiology