Question:
The antigen binding site of the antibody is formed of ______.
The antigen binding site of the antibody is formed of ______.
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An antibody has two heavy and two light chains. The binding site is made by the variable ends of both kinds of chains.
Updated On: Nov 12, 2026
- variable and constant regions of light chain
- variable and constant regions of heavy chain
- variable regions of both light and heavy chains
- constant regions of both light and heavy chains
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept
An antibody such as IgG is a Y-shaped molecule of two heavy and two light polypeptide chains.
Step 2: Structure of the chains
Each chain has a variable region at one end and a constant region for the rest of its length.
Step 3: Antigen binding site
The variable regions of the light chain and heavy chain come together at the tip of each arm and form the antigen binding site.
Final Answer:
The antigen binding site is formed by the variable regions of both light and heavy chains. \[ \boxed{\text{(C) }\text{variable regions of both light and heavy chains}} \]
An antibody such as IgG is a Y-shaped molecule of two heavy and two light polypeptide chains.
Step 2: Structure of the chains
Each chain has a variable region at one end and a constant region for the rest of its length.
Step 3: Antigen binding site
The variable regions of the light chain and heavy chain come together at the tip of each arm and form the antigen binding site.
Final Answer:
The antigen binding site is formed by the variable regions of both light and heavy chains. \[ \boxed{\text{(C) }\text{variable regions of both light and heavy chains}} \]
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