A-LevelBiologyInfectious diseases9700/12 · Oct/Nov 2023 · 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?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
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
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
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