Which of the following chemicals is a disinfectant for soft contact lenses?

A. glutaraldehyde
B. hydrogen peroxide
C. hexachlorophene
D. hypochorites
E. alcohol


Answer: B

Biology & Microbiology

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Complementary DNA strands are held together by

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Which is NOT a compound?

a. salt (NaCl) b. a carbohydrate (contains C, H and O) c. carbon (C) d. a nucleotide (contains P, C, H, and O) e. methane (CH4)

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Growth refers to an increase in the __________ of

cells. a. size b. number c. differentiation d. volume e. all EXCEPT “differentiation”

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An ampicillin-sensitive culture of E. coli is From the list BELOW, which of the following is the most logical sequence of steps for splicing foreign DNA into a plasmid and inserting the plasmid into a bacterium?

A. only the lactose-positive bacteria will grow. B. only the ampicillin-sensitive bacteria will grow. C. only the bacteria with the plasmid will grow. D. all bacteria will grow. E. no bacteria will grow.

Biology & Microbiology