A-LevelBiologyNucleic acids and protein synthesisMay/June 2015Paper 1 Q61 Mark

Ribosomes consist of two subunits, each containing rRNA. An analysis of all the 70S ribosomes from a single cell of the bacterium, Escherichia coli, showed that there were: • 38000 rRNA molecules • 2 main types of rRNA molecule • 19000 copies of each type of rRNA molecule How many 70S ribosomes were there in the E. coli cell?

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

The correct answer is B: 19000.

Q: What topic does this question test?

This question tests Nucleic acids and protein synthesis in A-Level Biology (syllabus code 9700). It is worth 1 mark.

A9500

B19000

C38000

D76000

✓ Correct Answer

The correct answer is B: 19000

📋 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 Nucleic acids and protein synthesis 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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