Question

What are the main constituents of cell membrane?
1. Carbohydrate
2. DNA
3. RNA
4. Lipoprotein

Answer 1

Correct Answer - Option 4 : Lipoprotein

The correct answer is Lipoprotein.

• The lipid bilayer is a biological membrane consisting of two lipid molecules.
• Each lipid molecule is made up of a hydrophilic head and a hydrophobic tail. It is a functional part of all cellular membranes.
• A cell wall is a structural layer surrounding some types of cells, just outside the cell membrane.
• The cell membrane is a lipid bilayer and is composed of lipoproteins and carbohydrates.

• The difference between the cell wall and the cell membrane is a follows -

Cell wall	Cell membrane
Present only in plans and in some fungi, bacteria, algae	Present in all types of cells in humans, animals, etc.
The outermost part of the plant cell	The outermost part of the animal cell
thickness is .1 µm to several µm	thickness is 7.5-10 µm
metabolically inactive	metabolically active