a retrovirus -- such as HIV -- replicate using an enzyme (reverse transcriptase) to copy RNA into DNA. Most cells have DNA in their natural state and transcribe to RNA (ribonucleac acid) during replication. A retrovirus does things backwards -- RNA, not DNA, is its natural genetic state.
RETROVIRUS
Meaning of RETROVIRUS in English
AIDS English Glossary. Английский словарь СПИДа. 2012