Question

Which of these is not a function of the plasma membrane?

A) It is selectively permeable.
B) It prevents potassium ions from leaking out and sodium ions from crossing into the cell.
C) It acts as a site of cell-to-cell interaction and recognition.
D) It encloses the cell contents.

Answer 1

The plasma membrane is selectively permeable, allows cell-to-cell interaction, and encloses the cell's contents.

Step-by-step explanation:

The plasma membrane is selectively permeable and allows certain substances to enter or leave the cell while preventing others from crossing. It also acts as a site of cell-to-cell interaction and recognition, enabling tissue and organ formation and playing a role in the immune response. Additionally, the plasma membrane encloses the contents of the cell, defining its borders and protecting its internal structures.