Pure cultures cannot be isolated using the ______ method
a. roll tube
b. streak plate
c. most probable number
d. agar dilution
Answer: c. most probable number
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Filtrate that is removed from the blood is
collected by the a. loop of Henle. b. glomerulus. c. distal tubule. d. proximal tubule. e. Bowman's capsule.
From the Luria-Delbruck fluctuation test, when would mutations arise in yeast cells to allow for survival in the presence of toxic levels of hydrogen peroxide?
A) Mutations are adaptive and would have appeared after most of the cells died in the presence of hydrogen peroxide. B) Mutations are adaptive and would have formed prior to being exposed to hydrogen peroxide. C) Mutations are random but would not have formed until after the hydrogen peroxide was introduced. D) Mutations are adaptive and would have appeared immediately in response to the hydrogen peroxide. E) Mutations are random and would have appeared prior to being exposed to hydrogen peroxide.
Well-fed individuals who remain hungry are likely
producing excessive amounts of a. leptin. b. ghrelin. c. gastric juice. d. pancreatic hormones. e. cholecystokinin.
Deserts typically form at __________ latitude where
__________. a. 30 degrees; warm dry air descends b. 60 degrees; warm dry air descends c. 0 degrees; there is intense sunlight d. 60 degrees; warm dry air ascends e. 75 degrees; rising air picks up moisture