What must first occur for transcription to begin?
A) mRNA moves the code from the nucleus to the ribosome for protein
B) production. A gene is expressed through protein production.
C) RNA polymerase attaches to the promoter.
D) A repressor protein must attach to the operator.

When a virus infects a host cell, it uses the cell's machinery to make copies of its own genetic material in a process called replication. finally, during the process of self-assembly, that protein shell and the copies of the virus's genetic material are assembled into new viruses.

Iam not sure but to me it with be a or dsorry if i was late! hope this ! : )if you really want me to find out the answer that is correct tell me and i will do more research but the a or d makes sense to me.