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Infectious Disease and Immunity
Quick questions on The adaptive immune response: H2 Biology Infectious Disease and Immunity
6short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is antigen presentation?Show answer
After a phagocyte (such as a macrophage) engulfs a pathogen, it displays the pathogen's antigens on its surface, becoming an antigen-presenting cell. This activates the adaptive response.
What is the cell-mediated response (T lymphocytes)?Show answer
A helper T lymphocyte with a complementary receptor binds the presented antigen and is activated. It then:
What is the humoral response (B lymphocytes)?Show answer
A B lymphocyte whose receptor (antibody) is complementary to the antigen is selected (clonal selection) and, helped by the helper T cell, activated. It divides by mitosis (clonal expansion) into:
What is q1?Show answer
State what is meant by an antigen. [1 mark]
What is q2?Show answer
Describe the role of plasma cells in the humoral response. [2 marks]
What is q3?Show answer
Explain the role of helper T lymphocytes in the adaptive response. [2 marks]
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