Question

1. What does the above diagram illustrate?
2. Name the labelled ‘a’ and ‘b’.
3. Name the type of cells that produces this molecule.

Answer 1

1. The above diagram illustrates an immunoglobulin antibody molecule.
2. 1. Antigen-binding site (variable region)
   2. Constant region (heavy chain region)
3. This molecule (antibody) is produced by plasma cells, which are specialized B-lymphocytes (B-cells).