16. Which of the following is true about B cells? development very efficient the

Question

16. Which of the following is true about B cells? development very efficient the number of B cells in the body is fixed - doesn't change during infections stem cells generate about one million new B cells daily at each phase in B cell development, many cells stopped from proceeding further a. b. c. d. 17. Positive selection a. occurs in the bone marrow b. results in development of memory B cells c. does not involve antigens d. is a result of chemokines from stromal cells attracting immature B cells 18. For a plasma cell to develop, which of the following is not needed? a. antibody b. mature, naive B cell c. CD4 helper T cell d. antigen 19. How do B-1 cells differ from "regular"' B cells? a. b. arise later in life more common c. have a T cell surface glycoprotein d. reactive to protein Antigens

Explanation / Answer

16. Answer is option A

The development of B cells is efficient and it increases it's number in body during infection. It increases rapidly only during infection.

17. Answer is option C

Positive selection occurs through antigen-independent signaling involving both the pre-BCR and the BCR.

18. Answer is option B.

It doesn't need mature native B cells.

19. Answer is option B

B 1 cells develop in the early life, in fetus and it is commonly present in body through out the life. B1 cells appear to be the primary source of dynamic T cell independent (TI) antibody production.

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