The pH of unpolluted rainwater is closest to:
a. 2
b. 4
c. 6
d. 8
e. 10
c
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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
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.
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.
There are how many different types of amino acids?
a. 5 b. 10 c. 15 d. 20 e. 50