OBJECTIVE LIFE SCIENCE
SIGNALLING IMMUNOLOGY CANCER
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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When a macrophage engulfs a pathogen and displays the antigens, what happens next?
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Helper T cells pick up information about the specific pathogen
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B cells produce antibodies
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Killer T cells destroy more pathogens
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Nothing
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Explanation:
Detailed explanation-1: -Once activated, the effector helper T cell can then activate a B cell that specifically displays the same complex of foreign peptide and class II MHC protein on its surface (see Figure 24-66).
Detailed explanation-2: -Armed helper T cells that recognize the peptide:MHC complex then deliver activating signals to the B cell. Thus, protein antigens binding to B cells both provide a specific signal to the B cell by cross-linking its antigen receptors and allow the B cell to attract antigenspecific T-cell help.
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