Analogous structures are structures with different evolutionary ancestries but they have the same function. Examples include; wings of birds, insects and bats. On the other hand homologous structures have similar ancestries and common traits but may not have the same function in an organism. Well; in the above question Human apes have five fingers they can use to grasp objects, which i think these are homologous structures.
When these viruses insert their genome into the host cell, they usually have a reverse transcriptase enzyme that converts the RNA to DNA before it is integrated into the host genome. This is before the host cell machinery is hijacked to replicate the viruses components.
