AP BIOLOGY

Detailed explanation-1: -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-2: -The plasma membrane of some bacteria is surrounded by a cell wall and a distinct outer membrane. The outer membrane contains porins, which form open aqueous channels allowing the free passage of ions and small molecules.

Detailed explanation-3: -Plasma membranes range from 5 to 10 nm in thickness. For comparison, human red blood cells, visible via light microscopy, are approximately 8 µm wide, or approximately 1, 000 times wider than a plasma membrane.

Detailed explanation-4: -cell membrane, also called plasma membrane, thin membrane that surrounds every living cell, delimiting the cell from the environment around it.

Detailed explanation-5: -It helps in maintaining the integrity of the interior of the cells. It serves as a base for cellular attachment and supports the cell. The cell membrane is thin as it functions as a selectively permeable membrane that allows the transport of substances.