A-LevelBiologyCell membranes and transportMay/June 2015Paper 1 Q171 Mark

Which set of factors will produce the most fluid cell surface membrane?

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.

Aan increase in proportion of phospholipids with saturated fatty acid chains, an increase in distance between phospholipid molecules

Ban increase in proportion of long fatty acid chains, an increase in proportion of phospholipids with unsaturated fatty acid chains

Can increase in proportion of long fatty acid chains, an increase in temperature

Dan increase in proportion of phospholipids with unsaturated fatty acid chains, an increase in temperature

✓ Correct Answer

The correct answer is D: an increase in proportion of phospholipids with unsaturated fatty acid chains, an increase in temperature

📋 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 May/June 2015 examination, Paper 1 Variant 2.

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