A-LevelBiologyEnzymesOct/Nov 2010Paper 1 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?
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.
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The correct answer is D. This question tests the candidate's understanding of enzymes within the Biologysyllabus. The examiner's mark scheme requires...
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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...
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