Question: Answer the following question given this paragraph: Molecules in the cell membrane allow it to be semipermeable. The membrane is made of a double layer of phospholipids (a "bilayer") and proteins ( Figure below ). Recall that phospholipids, being lipids, do not mix with water. It is this quality that allows them to form the outside barrier of the cell. Q: Phospholipids are unable to mix with what? Choices: - nitrogen - solids - air - water A:
Answer:
water