NEET BIOLOGY

Detailed explanation-1: -Cell membranes serve as barriers and gatekeepers. They are semi-permeable, which means that some molecules can diffuse across the lipid bilayer but others cannot. Small hydrophobic molecules and gases like oxygen and carbon dioxide cross membranes rapidly.

Detailed explanation-2: -The cell membrane is called selectively permeable as it only allows specific molecules to pass. Only specific molecules like water and gaseous molecules can pass through the cell membrane directly. It stops the flow of other molecules towards the two sides.

Detailed explanation-3: -The cell membrane is semi-permeable in nature in that it allows only certain substances to pass through while preventing others. The cell membrane regulates (adjusts) what comes in and what goes out of the cell.

Detailed explanation-4: -The cell membrane is a semi-permeable membrane that allows only selected molecular entities to pass through it. The ease with which a molecule can pass through the cell membrane is known as the permeability of the cell membrane. It also refers to the rate at which the passive diffusion occurs through the cell membrane.