AP BIOLOGY

Detailed explanation-1: -All cells have a cell membrane, although there are slight variations. Some cells also have cell walls. While these cell walls provide additional protection and support, they do not replace the function of the cell membrane.

Detailed explanation-2: -The cell membrane, also called the plasma membrane, is found in all cells and separates the interior of the cell from the outside environment. The cell membrane consists of a lipid bilayer that is semipermeable. The cell membrane regulates the transport of materials entering and exiting the cell.

Detailed explanation-3: -All cells have a cell wall. Plant cells are surrounded by a cell membrane and outside this is a fairly rigid cell wall. The cell wall gives the plant cell a more definite shape than an animal cell. Animal cells do not have a cell wall.

Detailed explanation-4: -It separates the interior of the cell from the outside environment. The cell membrane comprises a lipid layer that is semi-permeable. The cell membrane is involved in the regulation of the transport of materials from and outside the cell. It is present in all cells.