DNA Structure and Replication
The chromosomal DNA complexes with

three types of histone as H1, H2A and H4
four types of histone as H1, H2A, H3 and H4
five types of histone as H1, H2A, H2B, H3 and H4
two types of histone as H1 and H4

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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?

It has low affinity for the correct dNTP's
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

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