Question

Observe the diagram above.
How many antigens will bind to this antibody?

• A. Only a single antigen will bind the cell; cell recognition is highly specific.
• B. Millions of antibodies will be able to bind to millions of antigens since there is a variable binding region on each antibody.
• C. For each antigen, there will be several B-cells and T-cells that will recognize the receptor molecule.
• D. Intra-cellular reception does not occur with antibodies, this only takes place in humoral immune responses.

Answer 1

The correct option is A Only a single antigen will bind the cell; cell recognition is highly specific.

Antibody consists of two types of regions, constant region and variable region. Antigen binds to the variable region. Only a single antigen will bind to the given antibody. The reaction between antigen and variable region of antibody is highly specific during immune reaction. For each antigen, there is one B-cell that will recognize the receptor molecule and produces specific antibody.

Thus, the correct answer is 'Only a single antigen will bind the cell; cell recognition is highly specific.'