Immune System – Section 1

16. Following are the defenses of the colon except

A. sIgA
B. fast flow rate
C. dense resident microbiota
D. mucus

Correct Answer: B. fast flow rate

17. Natural killer cells are involved in

A. tumor rejection
B. allograft rejection
C. non-specific killing of virus-transformed target cells
D. all of these

Correct Answer: D. all of these

18. Which of the following(s) is/are the determinants of antigenicity?

A. Chemical nature
B. Size of the antigen
C. Foreignness
D. All of these

Correct Answer: D. All of these

19. Which of the following is correct?

A. All T Cells are CD4+
B. An epitope can have multiple antigens
C. T Cell receptors are generated by random assortment of gene cassettes
D. MHC Class II molecules are generated by random assortment of gene cassettes

Correct Answer: C. T Cell receptors are generated by random assortment of gene cassettes

20. Immunity is not long-lasting to

A. influenza
B. whooping cough
C. diphtheria
D. mumps

Correct Answer: A. influenza

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