A-LevelBiologySelection and evolutionMay/June 2020Paper 1 Q371 Mark

Which statement about the development of resistance to antibiotics in bacteria is correct?

Q: What topic does this question test?

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

AAll mutations in bacteria result in resistance to antibiotics.

BAntibiotics increase the rate of mutation in bacteria.

CMutations leading to antibiotic resistance only occur when antibiotics are used to treat pathogenic bacteria.

DThe proportion of antibiotic-resistant bacteria in a population only increases if the antibiotic is used.

✓ Correct Answer

The correct answer is D: The proportion of antibiotic-resistant bacteria in a population only increases if the antibiotic is used.

📋 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 Selection and evolution in A-Level Biology (syllabus code 9700). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Biology May/June 2020 examination, Paper 1 Variant 2.

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