Virus RNA or DNA
Location: Outside U.S.
Date: Summer 2012
Why is it so that viruses contain either RNA or DNA? Why they don't contain both?
The simpler a virus is, the more copies can be replicated rapidly.
Thus, viruses that have a minimum amount of genes are favored. If a
virus can replicate with just one or the other (RNA or DNA), it can
have an advantage in reproduction over more complicated viruses. Also,
if the virus were to require both types of genes, the odds of
something going wrong increases -- and could make the virus unable to
Hope this helps,
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Update: November 2011