Final answer:
Complete retroviral genomes are found in the host DNA as proviruses, which are integrated forms of retroviral DNA. Retroviruses use reverse transcriptase to convert their RNA genome into DNA, which is then integrated into the host genome.
Step-by-step explanation:
Retroviral genomes that are complete are found in the host DNA. Retroviruses are RNA viruses that use the enzyme reverse transcriptase to convert their RNA genome into DNA. This DNA is then integrated into the host genome, becoming a permanent part of the host's DNA. The integrated retroviral DNA is called a provirus and can remain in the host for a long time.