This exam focus covers Exam Focus within Adaptive Immunity and Antibodies for GCSE Biology. Specific immune responses, antibody production, lymphocytes, memory cells It is section 13 of 15 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
Topic position
Section 13 of 15
Practice
20 questions
Recall
25 flashcards
Exam Focus
Very Frequently ExaminedAdaptive immunity is one of the highest-mark topics in AQA Unit 5 and underpins questions on vaccination (Topic 19) and monoclonal antibodies (Topic 21). Understanding it deeply unlocks marks across multiple topics.
- 4-mark B cell response question: Antigen detected → specific B cell selected (complementary receptor) → B cell divides → plasma cells produce antibodies → memory B cells formed. All five steps needed for full marks.
- 5–6 mark primary vs secondary response: Must include: time difference (5–10 days vs 1–3 days), antibody level comparison, mechanism (memory cells already present), and why the secondary response prevents disease. Include a named example such as vaccination.
- Antibody function (2 marks): Tag pathogens for phagocytosis AND neutralise toxins/prevent binding to host cells. Never say antibodies "kill" pathogens — they tag them.
- Higher tier — B vs T lymphocytes: Know that B cells produce antibodies and T cells include helper T cells (coordinate the response, activate B cells) and killer T cells (destroy infected cells). Know that HIV destroys helper T cells. These appear in 4-mark higher-tier questions.
Common mark losses: Saying antibodies kill pathogens directly (they tag them for phagocytes). Confusing plasma cells with memory cells (plasma cells make antibodies now; memory cells provide future protection). Describing the secondary response as slower than the primary.