Question

what is the main function of the cell membrane in all three cell types? synthesize proteins regulate the movement of substances into and out of the cell provide structural support store genetic information

Explanation:

The cell membrane is a semi - permeable barrier. It controls what enters and exits the cell, which is crucial for maintaining the cell's internal environment. Protein synthesis occurs in ribosomes (not the membrane). Structural support is mainly from the cell wall (in plant cells) or the cytoskeleton. Genetic information is stored in DNA (in the nucleus or nucleoid region).

Answer:

Regulate the movement of substances into and out of the cell