T4 bacteriophage RNA is converted to Double stranded DNA. Genome must be changed into positive sense mRNA code first to be read by your cells machinery. Genome can be used exactly like the bodies mRNA and directly translated, able to replicate using your bodies machinery. Double stranded DNA so can use hosts enzymes to replicate- infects bacteria cells and not human cells (but can transfer harmful things to the bacteria in your system). Double stranded DNA so can use hosts enzymes to replicate- can insert the DNA into the host cells DNA?