Question

Cell recognition and adhesion are facilitated by certain components of cell membrane. These components are generally

• A. Proteins and lipids
• B. Glycoproteins and glycolipids
• C. Lipids only
• D. Proteins only

Answer 1

The correct option is B

Glycoproteins and glycolipids

The correct option is B

Explanation of the correct option:

1. Cell membrane, also known as plasma membrane consists of protein and lipids in them, out of them glycolipids and glycoproteins contribute about 5 to 10% towards the mass of the cell membrane.
2. Glycoproteins and glycolipids are proteins and lipids that are present on the outer surface of the cell membrane with a carbohydrate group attached to them respectively.
3. These are the components that are responsible for cell recognition and adhesion.
4. The carbohydrate group of the glycolipids and glycoprotein on the surface of the cell membrane will link to the carbohydrate group of the other cell.

Explanation of the incorrect option:

Option A:

Proteins and lipids carry out a lot of functions like intercellular actions, the structural integrity of the cell, etc.

Option C:

Lipids in the plasma membrane are responsible for structural rigidity and also the shape of the cell etc.

Option D:

1. Proteins are responsible for various activities such as intercell actions from chemical signals from outside, creating pathways for nutrients across the plasma membrane
2. Hence, cell recognition and adhesion are facilitated by certain components of the cell membrane.

Final answer: These components are generally glycolipids and glycoproteins.