Question

Match the molecules in Column-I with their properties/functions mentioned in Column-II

• A. P - 3 ; Q - 2 ; R - 4 ; S - 5
• B. P - 5 ; Q - 4 ; R - 2 ; S - 1
• C. P - 2 ; Q - 3 ; R - 4 ; S - 1
• D. P - 5 ; Q - 2 ; R - 1 ; S - 5

Hint:

{IgM} is the first antibody in the immune response, while {IgE} is involved in allergic reactions. {IgA} is found in secretions, and {MHC} is involved in presenting antigens to T-cells.

Answer 1

The Correct Option is B

The correct matching between the molecules and their functions is as follows:
- IgM (P): IgM is the largest antibody and is the first to be produced during the primary immune response. It is involved in antigen presentation, especially during the initial exposure to an antigen. Therefore, P matches with 5 (Contains ten heavy and light chains).
- IgE (Q): IgE is associated with allergic reactions and plays a key role in hypersensitivity reactions. Therefore, Q matches with 4 (Associated with allergic reaction).
- IgA (R): IgA is the predominant antibody type in various body secretions such as saliva, tears, and mucus. It protects the mucosal surfaces from infections. Therefore, R matches with 2 (Predominant antibody type in various body secretions).
- MHC (S): MHC (Major Histocompatibility Complex) molecules are involved in antigen presentation to T-cells. MHC class I and class II molecules display foreign antigens to trigger immune responses. Therefore, S matches with 1 (Involved in antigen presentation).
Thus, the correct answer is option (B).