DNA Structure and Replication
The rapid appearance of HIV-1 strains that are resistant to AIDS drugs is due in part to which of the following property of its reverse transcriptase?

It lacks a proofreading exonuclease
AZT (zidovudine) is too expensive to be taken in effective doses
The RNase H domain of p66 causes error prone synthesis
It has low affinity for the correct dNTP's

ANSWER DOWNLOAD EXAMIANS APP

DNA Structure and Replication
Taylor, Woods and Hughes labeled Vicia DNA by allowing new DNA synthesis in the presence of radioactive thymine. After DNA replication (S phase of the cell cycle), it was observed that

neither chromatid was labeled
only one chromatid of a chromosome was labeled
both chromatids of a chromosome were labeled
both (a) and (b)

ANSWER DOWNLOAD EXAMIANS APP

DNA Structure and Replication
In a typical electrophoresis experiment, larger fragments of DNA move more

quickly, so they appear nearer the bottom of a gel photograph
slowly, so they appear nearer the top of a gel photograph
quickly, so they appear nearer the top of a gel photograph
slowly, so they appear nearer the bottom of a gel photograph

ANSWER DOWNLOAD EXAMIANS APP