AP BIOLOGY

Detailed explanation-1: -Cells divide in response to external signals in the form of protein. Proteins are polymers made up of strings of amino acids. Proteins serve many functions in organisms including transport of molecules, structure, cell adhesion and as signaling molecules such as hormones.

Detailed explanation-2: -Cell division requires a series of events, collectively known as the cell cycle (see Glossary), that ultimately lead to the duplication of DNA (DNA synthesis or S-phase) and the segregation of newly duplicated genomes (mitosis or M-phase) into two daughter cells.

Detailed explanation-3: -Cells need to divide for your body to grow and for body tissue such as skin to continuously renew itself. When a cell divides, the outer membrane increasingly pinches inward until the new cells that are forming separate from each other. This process typically produces two new (daughter) cells from one (parent) cell.