Exams › SSC CGL (Prelims) › General

Which of the following statements regarding human immunoglobulins is/are correct? 1. IgM is usually the first antibody produced in a primary immune response. 2. IgD is mainly found on the surface of B cells and functions as a receptor. 3. IgG is the principal antibody present in mucosal secretions like tears and saliva.

1. Only 1 and 2 are correct
2. Only 2 and 3 are correct
3. Only 1 and 3 are correct
4. 1, 2 and 3 all are correct

Correct answer: Only 1 and 2 are correct

Solution

IgM is the first antibody produced in a primary immune response, and IgD is mainly present on B-cell surfaces as a receptor. IgG is not the principal antibody in mucosal secretions; that role is mainly played by IgA.

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