Question

what is the primary function of the cell membrane? to produce energy for the cell to store genetic information to separate the cells interior from the external environment to synthesize proteins

Explanation:

The cell membrane is a selectively - permeable barrier. Its main role is to separate the cell's interior from the external environment, controlling the movement of substances in and out of the cell. Producing energy is the function of mitochondria, storing genetic information is the role of DNA in the nucleus, and protein synthesis occurs in ribosomes.

Answer:

To separate the cell's interior from the external environment