Immunological Terms Matching: J gene, Cyclosporin, Epitope, Hapten

This solution matches key immunological terms from Column I with their descriptions in Column II, focusing on core concepts essential for exams.

J gene Function

P. J gene corresponds to 4. Contributes to antibody diversity.

Explanation: The J (Joining) gene segment is a crucial component in the V(D)J recombination process. This genetic mechanism generates a vast repertoire of antibody (immunoglobulin) and T-cell receptor specificities, thus contributing significantly to immunological diversity.

Cyclosporin Function

Q. Cyclosporin corresponds to 1. Suppresses immune system by blocking calcineurin.

Explanation: Cyclosporin is a potent immunosuppressive drug. Its mechanism involves inhibiting the enzyme calcineurin, which is essential for the activation of T-lymphocytes. By blocking this pathway, Cyclosporin effectively dampens immune responses, used primarily in preventing organ transplant rejection.

Epitope Description

R. Epitope corresponds to 2. Antibody binding site on a large molecule.

Explanation: An epitope, also known as an antigenic determinant, is the specific part of an antigen (typically a large molecule like a protein or polysaccharide) that is recognized by the immune system, particularly by antibodies or T-cell receptors during an immune response.

Hapten Description

S. Hapten corresponds to 3. Small foreign molecule which elicits an immune response only when combined with a carrier molecule.

Explanation: A hapten is a small molecule that cannot independently elicit an immune response. However, when it binds covalently to a larger carrier molecule (like a protein), the resulting complex becomes immunogenic, and antibodies can be generated that may bind to the hapten itself.

Summary of Matches

The correct pairings are:

• P - 4
• Q - 1
• R - 2
• S - 3