An enzyme that breaks down the superoxide (O2-) is:
A) hydrogen peroxide
B) vitamin C
C) superoxide dismutase
D) glutathione
E) catalase
Answer: C) superoxide dismutase
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An organism with a temperature growth optimum near 80°C and a pH growth optimum between two and three is usually referred to as a(n) ________.
A. thermophile B. halophile C. thermoalkalophile D. thermoacidophile
Synthetic compounds that inhibit receptors by preventing the natural messenger from binding are known as
A) agonists. B) receptor upregulators. C) specific proteoglycans. D) syndecans. E) antagonists.
The only cytoplasmic organelles in animal cells aside from nuclei that contain DNA are ____________________
Fill in the blank(s) with correct word
Which structure is a covering for the gill chamber in ray-finned fishes?
a. swim bladder b. spiral valve c. operculum d. atrium e. lateral-line system