Well all cells in a multicellular organism have the same exact DNA (except for sex cells). But what makes each type of cell different physically and functionally is the genes that are expressed in those cells.So for like example a different section of the DNA molecule is expressed in a nerve cell than a skin cell.
Answer:
The answer is D a retrovirus inserts DNA into the host cells genes
B false, every time it drops by a power of 10
