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Mark scheme (A-level) : Paper 1 - June 2017 - AQA
3. Sodium ion and proton bind to the protein; 4. Protein changes shape (to move sodium ion and/or proton across the membrane); 3 max 3. Accept ‘Na+ and H+ bind to protein’ but do not allow incorrect chemical symbols 3.2 1. Tenapanor/(Group)B/drug causes a significant increase; OR There is a significant difference with
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