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

Biology & Microbiology

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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.

Biology & Microbiology

The only cytoplasmic organelles in animal cells aside from nuclei that contain DNA are ____________________

Fill in the blank(s) with correct word

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology