試題詳解

34. Why do RNA viruses appear to have higher rates of mutation?
(A) RNA viruses are more sensitive to mutagens.
(B) RNA viruses can incorporate a variety of nonstandard bases.
(C) RNA viruses replicate faster.
(D) Replication of their genomes does not involve the proofreading steps of DNA replication.
(E) RNA nucleotides are more unstable than DNA nucleotides.