The pH of unpolluted rainwater is closest to:

a. 2
b. 4
c. 6
d. 8
e. 10


c

Biology & Microbiology

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In the lac operon, Is mutations allow

A) constitutive expression of Lac proteins. B) regulated expression of Lac proteins. C) ?-galactosidase activity only. D) no expression of Lac proteins. E) none of the above

Biology & Microbiology

The most likely identification of an anaerobic, curved, gram-variable bacillus with tapered ends on Gram stain of vaginal secretions when vaginosis is suggested is:

a. Porphyromonas spp. b. Actinomyces. c. Mobiluncus. d. Fusobacterium spp.

Biology & Microbiology

The mammalian acrosome contains enzymes that

a. digest the zona pellucida. b. digest the endometrium. c. stimulate ovulation. d. stimulate sperm motility. e. inhibit premature ejaculation.

Biology & Microbiology

There are how many different types of amino acids?

a. 5 b. 10 c. 15 d. 20 e. 50

Biology & Microbiology