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: -Plasma membrane allows some material to pass through it while on the same time it blocks other material from entering through it… This is mainly because of the sizes and polarity of molecules. In other words its selects materials that can enter the cell… that’s the reason it is called as selectively permeable membrane.

Detailed explanation-3: -Structure and function of the cell membrane The cell membrane is semipermeable (or selectively permeable). It is made of a phospholipid bilayer, along with other various lipids, proteins, and carbohydrates.

Detailed explanation-4: -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.