A cell membrane that is selectively permeable
A) randomly chooses which substances will pass through.
B) can change which substances pass through by changing its lipid and protein content.
C) is impermeable to all substances but water.
D) will only allow substances in or out if their concentration in the cell is above or below a certain point.

Question

Quizplus · Accepted Answer

A selectively permeable membrane allows certain molecules or ions to pass through while preventing others from passing. This is achieved through the presence of specific lipid and protein molecules in the membrane that are able to interact with specific molecules or ions. By changing the lipid and protein content of the membrane, it is possible to alter its selectivity and allow different molecules or ions to pass through. Therefore, option B is the correct answer.

A Cell Membrane That Is Selectively Permeable