Question

50 points!!

Which is true about cell membranes?


Cell membranes consist of a single layer of phospholipids.


Cell membranes are made of lipids and carbohydrates.


Cell membranes are rigid and protect the cell.


Cell membranes form barriers around the cell.

Answer 1

Part of the cell membrane is a phospholipid bilayer,

Step-by-step explanation:

Cell membranes are composed of proteins and lipids. Since they are made up of mostly lipids, only certain substances can move through. Phospholipids are the most abundant type of lipid found in the membrane. Phospholipids are made up of two layers, the outer and inner layers., made of two layers of phospholipid molecules. However, the cell membrane also contains other macromolecules like membrane proteins, and carbohydrates. Therefore, we can say that the cell membrane is made of a phospholipid bilayer, but it is not only made of it.