6. Which of the following theory of antibody production is most widely accepted?

A. Side chain theory
B. Clonal selection theory
C. Direct template theory
D. Indirect template theory

7. Which is the most efficient complement fixing class of antibody?

A. IgE
B. IgA
C. IgM
D. IgG

8. The class of immunoglobulin, most abundant in body is

A. IgD
B. IgE
C. IgG
D. IgM

9. Which is not a function of IgG?

A. Major antibody in serum
B. First antibody type produced against an antigen during the primary antibody response
C. Activates or fixes complement
D. Involved in opsonization

10. J chain is present in

A. IgA
B. IgM
C. Both (a) and (b)
D. IgE