Those with the highest risk for becoming infected with hiv are
a. homosexual and bisexual men.
c. the sexual partners of high risk people.
b. intravenous drug abusers.
d. all of the above

Why do rna viruses appear to have higher rates of mutation? a) rna nucleotides are more unstable than dna nucleotides.b) replication of their genomes does not involve proofreading.c) rna viruses can incorporate a variety of nonstandard bases.d) rna viruses are more sensitive to mutagens.