Retroviridae
The cells most oftenly infected by HIV are

None of these
Null cells
CD8 + T lymphocytes
CD4 + T lymphocytes

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Retroviridae
HIV or Human Immunodeficiency Virus is considered unique because each virus contains:

a genome made up of both DNA and RNA components
more than 100 copies of the viral genome
a viral enzyme known as reverse transcriptase
sticky proteins that allow it to bind tightly to host cells

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