Question

Which of the following is the most abundant lipid in cell membrane?
A. Chitin
B. Cholesterol
C. Steroid
D. Phospholipid

Answer 1

Hint: Membrane lipid molecules are divided into three categories: phospholipids, cholesterol, and glycolipids. The inner and outer monolayers have different lipid compositions, representing the different roles of the two faces of a cell membrane.

Complete answer:
Membrane lipids form a bilayer that acts as a living cell's containment unit. Membrane lipids also serve as a matrix for membrane proteins. Traditionally, lipids were thought to only have a structural function. Lipids have a wide range of functions: They play a role in cell growth and adhesion regulation. They help to make other biomolecules by biosynthesis.
They help to make other biomolecules by biosynthesis. They have the potential to improve enzyme enzymatic activity.
In the cell membrane, phospholipids are the most abundant. The bi-layered membrane structure is formed by them. The plasma membrane also includes cholesterol and glycolipids in addition to phospholipids. The phospholipid sphingomyelin is found in the cell membrane and is a type of phospholipid.

So, the correct answer is the option D Phospholipids.

Phospholipids protect cells by acting as barriers in their membranes, and they also act as barriers for the organelles within those cells. Phospholipids serve as conduits for different substances to pass across membranes.

Note:
Membrane proteins are found in a continuous double layer of lipid molecules in biological membranes. Individual lipid molecules will diffuse rapidly inside their own monolayer, making this lipid bilayer fluid. The lipid molecules in the membrane are amphipathic.