Question

Antigen binding sites are present in ...............

• A. Fab regions of an antibody
• B. Fc region of an antibody
• C. Only in the light chain
• D. Only in the heavy chain

Hint:

The Fab regions of antibodies are crucial for recognizing and binding specific antigens. They contain the antigen-binding sites made up of both the light and heavy chains.

Answer 1

The Correct Option is A

The antigen binding sites are located in the Fab regions of the antibody. These regions are responsible for recognizing and binding to specific antigens.
(1) Fab regions of an antibody: This is the correct answer. The antigen binding sites are found in the Fab regions of the antibody.
(2) Fc region of an antibody: The Fc region is involved in immune system interactions but does not contain antigen binding sites. Hence, this is incorrect.
(3) Only in the light chain: The light chain contributes to the Fab region, but antigen binding sites are not solely located in the light chain. Hence, this is incorrect.
(4) Only in the heavy chain: Similar to the light chain, the heavy chain contributes to the Fab region, but antigen binding sites are not exclusively located in the heavy chain. Hence, this is incorrect.
Conclusion: The correct answer is Option 1: Fab regions of an antibody as this is where the antigen binding sites are located.