In order for a lymphocyte to respond to an antigen, the antigen must A. bind to

Question

In order for a lymphocyte to respond to an antigen, the antigen must A. bind to specific receptors on the lymphocyte membrane B. enter the cytoplasm of the lymphocyte. C. depolarize the lymphocyte D. bind to the DNA of the lymphocyte E. be phagocytized by the lymphocyte If the barrier protections (mucus, stomach acid, and skin) fail to exclude pathogens, the first line of cellular defense against pathogens are the A. plasma cells B. phagocytes. C. Tlymphocytes D. B lymphocytes. E. NK cells Chemicals released by some of the leukocytes can function in A. poisoning and killing invading cells. B. attracting additional immune cells. C. digesting invading cells D. A and B E. A, B, and C

Explanation / Answer

1.INORDER FOR A LYMPHOCYTE TO RESPOND TO AN ANTIGEN THE ANTIGEN MUST

ANS : MUST BIND TO SPECIFIC RECPTORS ON LYMPHOCYTIC MEMBRANE

2.IF THE BARRIER PROTECTIONS FAIL TO EXCLUDE PATHOGENS THE FIRST LINE OF CELLULAR DEFENSE AGAINST THE PATHOGENS ARE ........

ANS : B.PHAGOCYTES

3.CHEMICALS RELEASED BY SOME LEUCOCYTES CAN FUNCTION IN

ANS : E ] A,B & C

THE LEUKOCYTES GRANULOCYTES HAVE GRANULES THAT HAS CHEMICALS WHICH CAN KILL INVADING CELLS..

THE MONOCYTES WILL ACT AS MACROPHAGES WHICH CAN ENGULF AND KILL THE BACTERIA.

THE CHEMICALS RELEASED BY LEUKOCYTES WILL ATTRACT MORE IMMUNE CELLS TO THE SITE .

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