Which of the following is mismatched?

a. acetylcholine; muscle contraction
b. endorphin; pain perception
c. norepinephrine; fight-or-flight response
d. serotonin; sexual function
e. GABA; major inhibitor in the brain


Answer: d

Biology & Microbiology

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Which amino acid can be involved in special covalent "disulfide bridges" that, when present, help to stabilize the

tertiary and quaternary structure of proteins?

a. proline b. alanine c. leucine d. cysteine e. methionine

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Which provides a more stable genome, DNA or RNA?

What will be an ideal response?

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In horsetails, lycophytes, and whisk ferns, ____

a. spores give rise to gametophytes b. the main plant body is a gametophyte c. the sporophyte bears sperm- and egg-producing organs d. the gametophyte is the dominant stage in the life cycle e. the gametophyte produces spores

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Which group(s) within the Alveolata include(s) members that are important in ocean food webs, cause(s) red tides that kill many fish, and may even be carnivorous?

a. ciliates b. apicomplexans c. Dinoflagellates d. A and B only e. A,B, and C

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