Organism X produces molecule Y, which blocks the activity of 70S ribosomes. An experiment was carried out to investigate the effect of Y on bacterial cells. An agar plate with bacteria growing all over its surface had four wells cut into the agar. Different substances were added to each well and the agar plate with bacteria was incubated for a week. The diagram shows the results after a week. [Figure 37.1] Which conclusions can be made from these results?
✓ Correct Answer
The correct answer is B: molecule Y functions as an antibiotic: ✓, molecule Y cannot be released from cells of organism X: ✓, molecule Y would also affect the synthesis of proteins from nuclear DNA in a human cell: X
📋 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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