Which statement is FALSE ? Question 5 options: Bone marrow and thymus are the pr
ID: 87184 • Letter: W
Question
Which statement is FALSE?
Question 5 options:
Bone marrow and thymus are the primary sites of lymphocyte maturation.
Specific immune responses differ from nonspecific ones in that the former are mediated by lymphocytes.
B and T cells are preprogrammed to recognize specific antigens.
In cell-mediated immune responses, immune cells directly kill antigen-bearing cells.
Cytotoxic T cells kill body cells by phagocytosis.
1)Bone marrow and thymus are the primary sites of lymphocyte maturation.
2)Specific immune responses differ from nonspecific ones in that the former are mediated by lymphocytes.
3)B and T cells are preprogrammed to recognize specific antigens.
4)In cell-mediated immune responses, immune cells directly kill antigen-bearing cells.
5)Cytotoxic T cells kill body cells by phagocytosis.
Explanation / Answer
Answer: 5 (As explained below)
The T cells secrete contents from their vesicles into the space between itself and the target cell to which it is attached. These vesicles contain perforin which penetrates the membrane of the target and lyses it. There is no phagocytosis involved.
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