Question

1. To perform different activities cell needs_________​

Answer 1

Answer:

cellular respiration

Answer 2

Answer:

The life of a cell depends on its environment and on the activities that take place within it. This section explains some of the processes that take place in cells and some of the ways cells respond to their environment.

The functions of all cells depend on or require special molecules called enzymes. Enzymes are proteins that help chemical reactions take place. They help cells build products like proteins, make copies of DNA molecules, make energy available for cell work, and even break down certain molecules. Each enzyme is very specific in its action.

Without enzymes, most chemical reactions that take place in cells would proceed very slowly, if at all. Enzymes enable those reactions to happen faster.

Different enzymes exist in different parts of a cell. Enzymes on the surface of a cell help receptor proteins signal the cell when they detect certain molecules in the fluid environment. Enzymes in the cell cytoplasm allow the structural proteins of the cytoplasm to do their work, for instance, to contract, to change the cell shape, or to divide the cell. Enzymes in the nucleus of a cell allow the cell to copy its DNA. Enzymes in the mitochondria of a cell allow the cell to convert energy from food nutrients into ATP.