The main function of the plasma membrane is to:
A) provide the interior of the cell an enclosed environment which no molecules may cross.
B) provide a selectively permeable barrier with the aid of transport proteins.
C) give eukaryote and prokaryote cells structural strength.
D) allow only the free passage of water in and out of the cell.
E) None of the above.

Question

Quizplus · Accepted Answer

The plasma membrane acts as a selectively permeable barrier that allows some substances to pass through while blocking others. This is achieved with the help of transport proteins like channels and pumps. The membrane also helps to maintain the cell's internal environment by regulating the movement of ions and other molecules. While the membrane does provide some structural support, it is not its main function. The membrane also allows the passage of other molecules besides water.

The Main Function of the Plasma Membrane Is To