A-LevelBiologyImmunityMay/June 2014Paper 1 Q351 Mark
During a primary immune response, the following events occur. 1 Some B-lymphocytes form plasma cells. 2 B-lymphocytes with the specific cell surface receptors divide repeatedly by mitosis. 3 Specific antibody is produced. 4 T-helper cells secrete cytokines. 5 T-helper cells identify a specific antigen. In which order will the events occur?
A2→1→4→3→5
B2→4→3→1→5
C5→4→2→1→3
D5→4→3→1→2
✓ Correct Answer
The correct answer is C: 5→4→2→1→3
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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