Biology / Bio 1913 · Atom · ~20 seconds
Baltimore Groups IV–VII and Retroviruses
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Groups IV and V carry single-stranded RNA read or copied into mRNA; Groups VI and VII use reverse transcriptase to make DNA from RNA.
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HIV, a Group VI retrovirus, reverse-transcribes its RNA genome into DNA before inserting it into the host cell's genome.
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Reverse transcription runs counter to a cell's usual DNA-to-RNA direction— retroviruses are the named exception, not the rule.