A-LevelBiologyInfectious diseasesOct/Nov 2023Paper 1 Q371 Mark
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?
Amolecule 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: ✓
Bmolecule 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
Cmolecule Y functions as an antibiotic: ✓, molecule Y cannot be released from cells of organism X: X, molecule Y would also affect the synthesis of proteins from nuclear DNA in a human cell: ✓
Dmolecule Y functions as an antibiotic: X, 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: ✓
✓ Correct Answer
The correct answer is B. This question tests the candidate's understanding of infectious diseases within the Biologysyllabus. The examiner's mark scheme requires...
📋 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...
🔒
Unlock the Examiner's Answer
Sign up for free to reveal the correct answer, the official mark scheme breakdown, and the examiner trap analysis for this question.
Sign Up Free to Unlock →Join thousands of Cambridge students already using Oracle Prep