The proofreading of the DNA occurs in the _________
A. 5' to 3' direction
B. 3' to 5' direction
C. Both directions
B
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The HIV genome is especially prone to mutation because
A. it is made of DNA. B. it is an emerging virus. C. it is copied by reverse transcriptase, which lacks a proofreading function D. of the many different drugs HIV patients must take.
Which of the following is false regarding NK cells?
a. Helper T cells stimulate them to divide. b. They attack cells tagged for destruction by antibodies. c. They kill cells with normal MHC markers. d. They detect stress markers on cancerous cells. e. They detect and destroy cells with altered MHC markers.
A bacterial chromosome consists of a:
a. linear DNA molecule many times larger than the cell. b. circular DNA molecule many times larger than the cell. c. circular DNA molecule smaller than the cell. d. linear DNA molecule smaller than the cell. e. linear or circular DNA molecule smaller than the cell.
The characteristic of the human immunodeficiency virus (HIV) that makes it different from other RNA viruses is that it ____________.
A. can synthesize mRNA from a double-stranded DNA template. B. inserts into the DNA of the host C. causes hepatitis D. can synthesize DNA from an RNA template