DNA Structure and Replication
What bands will be observed in a cesium chloride gradient after two rounds of replication?

One medium and one heavy band
One medium band
One light, one medium and one heavy band
One light and one medium band

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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 lacks a proofreading exonuclease
AZT (zidovudine) is too expensive to be taken in effective doses
It has low affinity for the correct dNTP's

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