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: B) It prevents potassium ions from leaking out and sodium ions from crossing into the cell.
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