A-LevelBiologyImmunityOct/Nov 2012Paper 1 Q371 Mark

The graph shows the primary and secondary responses of the immune system to antigens. [Figure 37.1] What are responses X and Y?

Q: What topic does this question test?

This question tests Immunity in A-Level Biology (syllabus code 9700). It is worth 1 mark.

AX: primary response, Y: secondary response caused by cloning of B-lymphocytes formed during the primary response

BX: primary response, Y: secondary response caused by cloning of T-lymphocytes formed during the primary response

CX: secondary response caused by cloning of B-lymphocytes formed during the primary response, Y: primary response

DX: secondary response caused by cloning of T-lymphocytes formed during the primary response, Y: primary response

✓ Correct Answer

The correct answer is C: X: secondary response caused by cloning of B-lymphocytes formed during the primary response, Y: primary response

📋 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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About This A-Level Biology Question

Topic

This multiple-choice question tests Immunity in A-Level Biology (syllabus code 9700). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Biology Oct/Nov 2012 examination, Paper 1 Variant 2.

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