The reactivity of an atom depends on the number of

a. protons.
b. neutrons.
c. electrons.
d. valence electrons.
e. protons and neutrons in the nucleus.


Answer: d. valence electrons.

Biology & Microbiology

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Cyclic 2,3-diphosphoglycerate (cDPG) is present in molar quantities in the cytoplasm of many hyperthermophilic methanogens. The function of this compound is to

A) prevent rRNA misfolding. B) prevent chemical damage to DNA at high temperatures. C) counteract the effects of high osmotic environments. D) activate hydrogen gas.

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Plant respiration occurs in

a. chloroplasts. b. mitochondria. c. the surrounding air. d. More than one answer is correct.

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What happens when a phage containing bacterial DNA attaches to and injects DNA into another bacterial cell?

a. the phage is destroyed b. the phage replicates c. the bacterial cell dies from the phage infection d. the bacterial cell lives and produces many copies of the phage e. the bacterial cell becomes a partial diploid and may undergo genetic recombination

Biology & Microbiology

Which of the following structures is found inside the nuclear membrane? 

A. endoplasmic reticulum B. centriole C. cell membrane D. nucleolus

Biology & Microbiology