Where do the reactions of the electron transport chain occur?

This is what i did 45-5=4040÷4=10so there are 10 white marbles but am not sure is just a question that am not sure

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.