Discussion
Match the molecules in Column-I with their properties/functions mentioned in Column-II
| Column-I | Column-II |
|---|---|
| P. IgM | 1. Involved in antigen presentation |
| Q. IgE | 2. Predominant antibody type in various body secretions |
| R. IgA | 3. Can pass through placenta |
| S. MHC | 4. Associated with allergic reaction |
| 5. Contains ten heavy and light chains |
Answer: B
The correct match is P-5 ; Q-4 ; R-2 ; S-1.
- IgM is secreted as a pentamer of five four-chain units, so it contains ten heavy and ten light chains (5).
- IgE binds Fcε receptors on mast cells and basophils and triggers allergic reactions (4).
- IgA, as a secretory dimer, is the predominant antibody in secretions such as saliva, tears, milk and mucus (2).
- MHC molecules display peptides to T cells, which is antigen presentation (1).
Item 3, crossing the placenta, belongs to IgG, which is not in the list. The other options misassign IgM, IgE and IgA, and the last gives MHC the ten-chain structure.
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