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Retrovirus

Retroviruses are positive, single-stranded RNA viruses. They are characterised by their replication mechanism.

Rather than translating their genomes directly into proteins, retroviruses each use a reverse transcriptase enzyme, which converts the RNA genome into DNA.

The viral DNA is then inserted into the host genome, and replicates every time the host genome is replicated.

Retroviruses include the human immunodeficiency virus (HIV).

These HIV retroviruses are seen under a scanning electron microscope. Viruses are too small to be seen clearly, even under this powerful magnifying aid.
These HIV retroviruses are seen under a scanning electron microscope. Viruses are too small to be seen clearly, even under this powerful magnifying aid.