[Campbell Biology P.1016] Based on Figure 43.23, which of the following cell types are primar... | Practice Question

Based on Figure 43.23, which of the following cell types are primarily activated by a second exposure to an antigen to initiate a rapid secondary immune response?

  • A: Antigen-presenting cells and B cells.
  • B: Plasma cells and active cytotoxic T cells.
  • C: Memory helper T cells, Memory B cells, and Memory cytotoxic T cells.
  • D: Cytotoxic T cells and Helper T cells.

Explanation

Figure 43.23 explicitly shows 'Antigen 2nd exposure ' directly stimulating 'Memory B cells' and 'Memory cytotoxic T cells'. The text also mentions 'memory B cells and memory helper T cells initiate a secondary humoral response'. Thus, memory cells are key for the rapid secondary response.