Reverse transcriptase is present in____________?
Correct answer: C. All retroviruses
- A. All RNA viruses
- B. All DNA viruses
- C. All retroviruses
- D. All viruses
Explanation
Retroviruses contain reverse transcriptase, which copies their RNA genome into DNA so it can integrate into the host-cell genome. Students may choose all RNA viruses because the enzyme is associated with an RNA genome, but most RNA viruses replicate without reverse transcription.
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About Viruses
Viruses are acellular infectious particles made of genetic material enclosed by a protein capsid, sometimes with a lipid envelope. Their replication depends on a host cell and may follow lytic or lysogenic cycles, so viral structure and reproduction differ fundamentally from those of cellular organisms such as bacteria.
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