What is the minimum concentration of sodium chloride that an extreme halophile requires for growth?

A) 2 M
B) 4 M
C) 6 M
D) 10 M


Answer: C

Biology & Microbiology

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The name “human” is an example of a

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Which of the following is not an activity of viral reverse transcriptase?

A. RNA degradation activity B. RNA-dependent DNA synthesis C. DNA-dependent RNA synthesis D. DNA-dependent DNA synthesis E. All of the choices given are activities of reverse transcriptase.

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What type of mutation alters the base but not the amino acid being coded for?

A. Silent B. Nonsense C. Back D. Point E. Missense

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The obvious advantage of the lactose operon is that

a. it allows bacteria to survive in the presence of lactose. b. lactose-metabolizing enzymes need not be made when lactose is not present. c. it enables bacteria to make lactose only in the presence of the proper enzymes. d. it negates the need for milk in the diet of adult humans. e. it enables glucose to substitute for lactose in the diet of lactose intolerant persons.

Biology & Microbiology