A-LevelBiologyCell membranes and transportOct/Nov 2009Paper 1 Q171 Mark

Cystic fibrosis is a disease where Cl¯ ions are unable to be transported into cells. Which structure in the cell surface membrane is faulty? [Diagram of a cell surface membrane with parts A, B, C, D labelled]

Q: What is the correct answer to this A-Level Biology question?

The correct answer is C: [Structure C in diagram].

Q: What topic does this question test?

This question tests Cell membranes and transport in A-Level Biology (syllabus code 9700). It is worth 1 mark.

A[Structure A in diagram]

B[Structure B in diagram]

C[Structure C in diagram]

D[Structure D in diagram]

✓ Correct Answer

The correct answer is C: [Structure C in diagram]

📋 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 Cell membranes and transport in A-Level Biology (syllabus code 9700). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Biology Oct/Nov 2009 examination, Paper 1 Variant 2.

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