Answer the following question given this paragraph: 

The plasma membrane also contains other molecules, primarily other lipids and proteins. The green molecules in Figure above , for example, are the lipid cholesterol. Molecules of cholesterol help the plasma membrane keep its shape. Many of the proteins in the plasma membrane assist other substances in crossing the membrane.


Q: What helps the plasma membrane keep its shape?

 Choices:

- molecules of carbohydrates

- molecules of oxygen

- cytoplasm

- molecules of cholesterol

A:
molecules of cholesterol
