Order the steps in the clonal expansion of antibodies and the production of antibodies.
  • 1. Using its TCR, the Th cell recognizes the viral epitope displayed by the B cell.2. Cytokines produced by the Th cell activate the B cell, which divides giving rise to two cell types - memory cells and plasma cells. 3. Plasma cells secrete antibodies that recognize the virus.
  • C. (1) Immunoglobulin receptors on the B cell recognize and bind the antigen. (2) An antigen fragment in complex with MHC class 2 is displayed on the B cell's surface. (3) The MHC-antigen complex binds a receptor on a TH cell. (4) The TH cell secretes cytokines that activate the B cell.
  • D. c and d
  • tumor necrosis factor (TNF)
Number 10
  • ...
  • IgE.
  • IgG.
  • TCR
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