Biology / Unit 9 Bio 1911 short lesson, about 20 seconds
Baltimore Groups I–III
Captions available
The idea
Group I viruses carry double-stranded DNA; Group II carry single-stranded DNA; Group III carry double-stranded RNA, each converted to mRNA differently.
In practice
Herpesviruses are Group I, transcribing mRNA like a host cell; rotavirus is Group III, transcribing mRNA from its double-stranded RNA genome.
Where people slip
Group II's single-stranded DNA genome must first become double-stranded before transcription— it cannot be transcribed directly in single-stranded form.
Your place on the trail
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