QCE Biology — Unit 3

Immune Response — Flashcards & Quiz

QCE Biology Unit 3 asks you to describe how the immune system protects against pathogens and produces long-term memory. You need to distinguish the three lines of defence: physical/chemical barriers, the innate inflammatory response, and the adaptive response driven by B and T lymphocytes. The clonal selection model and the speed difference between primary and secondary responses are high-yield exam content.

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Last updated: March 2026