A-LevelBiologyImmunityMay/June 2024Paper 1 Q391 Mark

Which statement about the properties of the antigen-binding sites in different antibody molecules is correct?

Q: What topic does this question test?

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

AThey are located on the light chains only.

BThey have a hinge region to give flexibility for different antigens.

CThey have binding sites for receptors on phagocytes.

DThey have variable amino acid sequences for different antigens.

✓ Correct Answer

The correct answer is D: They have variable amino acid sequences for different antigens.

📋 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 May/June 2024 examination, Paper 1 Variant 2.

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