AQA 74021

AA 1

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Exam (elaborations)

A-level BIOLOGY (7402/1) Paper 1 Mark scheme
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16

August 2022

2022/2023

A+
Question Marking Guidance Mark Comments 01.1 Any two of the following; Concentration of enzyme Volume of substrate solution pH 1 Allow same concentration of substrate 01.2 Ratio between 4:1 and 5:1;; 2 Initial rates incorrect but correctly used = 1 mark 01.3 At 60 ° C: 1. More kinetic energy; 2. More E–S complexes formed; 2 Allow converse for 37 ° C 01.4 Different times: 1. Higher temperature / 60 ° C causes denaturation of all of enzyme; 2. Reaction stops (sooner) because ...
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