The answer is; A
The operator site is usually associated with the promoter region of the operon. This region is bound by a repressor. The repressor acts as a physical barrier so the RNA polymerase does not bind to its promoter, or even if it binds, does not proceed to transcribe the genes.
DNA <em>contains genetic instructions for living things! </em>
More specifically, there are 3 main functions of DNA
1. to make proteins (also RNA)
2. to assist mutations!
3. To exchange the genetic material of parental chromosomes during meiotic cell division.
Answer:
Viruses depend on the host cells that they infect to reproduce
Explanation:
I think it might be the second one sorry if I’m wrong