Final answer:
Lambda and T4 phages are classified under Group I as double-stranded DNA (dsDNA) viruses in the Baltimore classification system. Retroviruses are part of Group VI, characterized by single-stranded RNA (ssRNA) genomes and the use of reverse transcriptase.
Step-by-step explanation:
The classes to which Lambda, T4, and Retroviruses belong can be determined using the Baltimore classification system.
- The Lambda phage is a bacteriophage and falls under Group I, which includes double-stranded DNA (dsDNA) viruses.
- The T4 phage, another well-known bacteriophage, also belongs to Group I as it has a dsDNA genome.
- Retroviruses, such as the HIV virus, are part of Group VI, characterized by their single-stranded RNA (ssRNA) genomes and the use of reverse transcriptase to transcribe DNA from RNA, creating a DNA intermediate.
These classifications help scientists understand the mechanisms of virus replication and guide the development of antiviral therapies.