Biology 9700 · AS & A Level · The immune system

The immune system — practice question

The diagram illustrates a section of the immune response. What are P, Q and R?

  • AP: antibody, Q: B-lymphocyte, R: T helper cell
  • BP: antibody, Q: T helper cell, R: B-lymphocyte
  • CP: antigen, Q: B-lymphocyte, R: T helper cell
  • DP: antigen, Q: T helper cell, R: B-lymphocyte

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