AQA A LEVEL BIOLOGY PAPER 1-7402_1-Final-MARK SCHEME-Jun21-v1.0

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A-level BIOLOGY 7402/1 Paper 1 Mark scheme June 2021 Version: 1.0 Final 1.Substrate binds to the active site/enzyme OR Enzyme-substrate complex forms; 2.Active site changes shape (slightly) ... so it iscomplementary to substrate OR Active site changes shape (slightly) so distorting/breaking/forming bonds in the substrate; 3.Reduces activation energy; Mark in pairs, 1 and 2 OR 3 and 4 OR 5 and 6 1.Boil OR Add (strong) acid/alkali; 2.Denatures the enzyme/ATP synthase; OR 3.Put in ice/fridge/freezer; 4.Lower kinetic energy so no enzyme-substratecomplexes form; OR 5.Add high concentration of inhibitor; 6.Enzyme-substrate complexes do not form; 1. (With) increasing Pi concentration, more enzyme-substrate complexes are formed; 2. At or above 40 (mmol dm-3) all active sites occupied OR At or above 40 (mmol dm-3) enzyme concentration is a limiting factor; [Show More]

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