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 B Two

An antibody, also known as an immunoglobulin is a large, Y-shaped protein which is produced mainly by plasma cells and it is used by the immune system to neutralize pathogens such as pathogenic bacteria and viruses. Antibodies are secreted by B lymphocytes of the adaptive immune system, mostly by differentiated B cells called plasma cells. Paratope is composed of one constant and one variable domain from each heavy and light chain of the antibody. An antibody molecule has two heavy and two light chains, so there are two variable domains in an antibody molecule.

So, the correct answer is 'Two'.