DNA Structure and Replication
The B-DNA structure found in solution is a

right-handed double helix of antiparallel chains (∼10 bp/turn)
left-handed zig-zag helix of antiparallel chains (10 bp/turn)
right-handed double helix of parallel chains (∼10 bp/turn)
left-handed double helix of antiparallel chains (10 bp/turn)

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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?

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

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