Question

What is the primary (main) function of lipid molecules in the plasma membrane?

- To provide an energy source for most cell activities.

- To provide a substance for enzyme activity in the cell.

- To provide a place to collect and store waste products within the cell.

-To provide a barrier to the movement of substances in and out of the cell.

Answer 1

Answer:

to provide a barrier to the movement of substances in and out of the cell

Explanation:

Lipid molecules in the plasma membrane form a lipid bilayer which creates a semi-permeable barrier between the inside and the outside of the cell. Water and small molecules can cross the membrane. Other large molecules like ions cannot.

Hope that helps.