AP BIOLOGY

Detailed explanation-1: -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-2: -What Makes the Cell Membrane Selectively Permeable? The cell membrane is selectively permeable due to its structure. The phospholipids are arranged in a bilayer with the hydrophobic tails facing inward. The tails are packed tightly together, thus preventing any large molecules from diffusing through.

Detailed explanation-3: -The plasma membrane is called as selectively permeable membrane because it regulates the movement of substances in and out of the cell. It means that the plasma membrane allows some material to pass through it while at the same time it blocks other material from entering through it.

Detailed explanation-4: -Phospholipids provide fluidity within the membrane and form a semi/ selectively permeable barrier. Hydrophobic substances and some small molecules can move through the lipid layers by diffusion.