A virus needs energy to replicate and produce new viral particles. It hijacks the host cell's machinery and resources to carry out these processes.
A basic characteristic of a virus is that it cannot survive or reproduce on its own. It requires a host cell to replicate and multiply.
No, a virus cannot catch a virus and become ill. A virus is a shell of protein containing DNA. A virus works by getting into a cell and "reprogramming it" to multiply and start to take of the organism. A virus cannot infect another virus because viruses are not cells themselves.
To insert into a healthy cell so that it can multiply.
virus
multiply
Viruses can only multiply (reproduce) within a host cell. The type of host cell is dependent on the virus' host range.
Reverse transcriptase. Runs off a DNA strand(s) from the virus RNA template.
Your question does not give enough information. What are "which"? Should there be more to the question?
Viruses replicate inside the host cells they infect. They hijack the cellular machinery of the host to make copies of themselves, leading to the multiplication of the virus.
zero.
A lytic virus begins to multiply right away. A lysogenic virus can "hide" for a very long time before multiplying. See link below: