Question 8 Which statement best describes the plasma membrane of a living plant cell? The plasma membrane of a plant cell is a designed to allow for the free flow of all protein substances to move into and out of the cell. b designed to allow certain substances to enter and certain substances to exit the cell. c composed of two layers of proteins with floating molecules of lipids only. d composed of two layers of proteins and carbohydrates only.

Answer 1

The statement that best describes the plasma membrane of a living plant cell is:

b) designed to allow certain substances to enter and certain substances to exit the cell.

The plasma membrane is selectively permeable, meaning it regulates the movement of substances, allowing some to pass while restricting others. It is primarily composed of a phospholipid bilayer with embedded proteins, not merely proteins or carbohydrates alone.