Viruses
Reverse transcriptase is a useful enzyme to have when

spikes are forming in the new virus
there are no host cells present
an RNA virus converts its RNA to DNA
nutrients are scarce

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Viruses
In order for a virus to replicate

the host cell must be undergoing mitosis
the capsid must enter the host cell cytoplasm
the host cell must lack a cell membrane
the genome must be released in the cytoplasm

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