Question

question 2 (2.5 points)
the plasma membrane
controls the contents of the cell
is composed mostly of cholesterol
is permeable to ions and polar molecules
is free of proteins
is rigid and impermeable

Explanation:

The plasma membrane is a selectively permeable barrier. It controls what enters and exits the cell, thus controlling the contents of the cell. It is mainly composed of phospholipids (not mostly cholesterol). It is not permeable to ions and polar molecules (they need transport proteins). It has proteins (like transport proteins, receptor proteins etc.). And it is not rigid (has fluidity) and is permeable (selectively).

Answer:

controls the contents of the cell