Question

How many variable segments are present in the basic structure of antibody molecule?

• A. One
• B. Two
• C. Three
• D. Four

Answer 1

The correct option is D Four

Antibodies are immunoglobulins or gamma globulins that are large, Y-shaped proteins, produced by plasma cells that are used by the immune system to identify and neutralise pathogens, like bacteria and virus. These are produced in response to the antigen. Although the general structure of all antibodies is very similar, a small region at the tip of the protein is extremely variable. This variable region is present at the end of both light chains and both heavy chains, thereby giving 4 such variable regions in each antibody.

So, the correct answer is option D.