Q: What substances that primarily comprise plasma membranes form a bilayer?


Read this paragraph and choose the correct option from the provided answers:

Plasma membranes are primarily made up of phospholipids (orange). The hydrophilic ("water-loving") head and two hydrophobic ("water-hating") tails are shown. The phospholipids form a bilayer (two layers). The middle of the bilayer is an area without water. There can be water on either side of the bilayer. There are many proteins throughout the membrane.

 Choices:

- amino acids

- enzymes

- steroids

- phospholipids


A:
phospholipids