Question

which of the following structures is semipermeable?
a red blood cells
b nucleus
c cell membrane

Explanation:

The cell membrane is a semi - permeable structure. It allows certain substances to pass through while restricting others, regulating the movement of materials in and out of the cell. Red blood cells are whole cells and the nucleus is an organelle within a cell, neither of which are semi - permeable structures in the context of this question.

Answer:

C. cell membrane