The virion of retroviruses contain single-stranded RNA (ssRNA). Other viruses with single-stranded RNA uses their polynucleotide strand like mRNA material. However, the mechanism for retroviruses is different.
What do virions of retroviruses contain that other animal virions do not?
A. a double stranded DNA genome
B. a single stranded DNA genome
C. a reverse transcriptase enzyme
D. a lysozyme enzyme
E. both C and D
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