Question

N 9 Viruses use the host's machinery to make copies of themselves. However, some human viruses require a type of replication that humans do not normally do. For example, humans normally do not have the ability to convert RNA into DNA. How can these types of viruses infect humans, when human cells cannot perform a particular role that the virus requires?

Answer 1

Answer:

This is because  the Viron  has in its genome a specialized code  for synthesising any missed enzyme for replication that is lacking in the host cell.

An example is the replication of the human  DNA cells by the Immunodeficiency virus(HIV) . Human  cells only have  enzymes for  copying  DNA templates, and   lacks the enzyme to convert the HIV  RNA genome  to human DNA.However these viruses have  in its genome; code for synthesising its own  RNA polymerase enzymes that copies  or transcribed  the   human DNA to HIV RNA.

 This  ability of the viral cell  to code  for the host's enzyme  has a therapeutic effect. Drugs can be targeted at the  viral polymerase enzymes to reduce the replication and therefore toxicity in the host cells.

Explanation: