Answer:
(d) A retrovirus is a
single-stranded RNA virus that stores its nucleic acid in the form of mRNA
genome (5'cap and 3'poly A tail).
In most viruses, DNA is transcribed into
RNA, and then RNA is translated into protein .However, in retroviruses their
RNA is reverse-transcribed into DNA, which is integrated into the host cell's
genome (when it becomes a provirus) and then undergoes the usual transcription
and translational process to express the genes carried by the virus,i.e., RNA
DNA RNA Polypeptide.
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