A-LevelBiologyEnzymes9700/12 · Oct/Nov 2010 · Q221 Mark
S and T are products of a biochemical pathway. A different enzyme, coded for specific genes, catalyses each step in the pathway. [Figure 22.1 showing a biochemical pathway with intermediates P, Q, R, S, T and enzymes/genes] What is the possible outcome to the pathway if a mutation in gene 3 leads to an inactive enzyme?
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.
AThere is a decrease in the activity of gene 1 and gene 2.
BThere is an accumulation of product S.
CThere is an increase in the rate of reaction of enzyme 4.
DThere is an increase in the production of T.
✓ Correct answer
D: There is an increase in the production of T.
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