Most of the Surface Area of a Plasma Membrane Consists

Question

Most of the surface area of a plasma membrane consists of
A) a protein bilayer.
B) a phospholipid bilayer.
C) carbohydrate molecules.
D) DNA.
E) cells.

Accepted Answer

The plasma membrane is composed mainly of a phospholipid bilayer, which makes up the majority of the membrane's surface area. This bilayer is made up of two layers of phospholipids with hydrophilic heads facing outward and hydrophobic tails facing inward, creating a barrier between the inside and outside of the cell. Proteins are also present in the membrane, but they do not make up the majority of the surface area. Carbohydrate molecules are present on the surface of the membrane but are not the main component of surface area. DNA is not present on the plasma membrane as it is located within the cell. Cells themselves are not a component of the plasma membrane but are contained within it.