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May 2025 Section II

0/34 marks

2025 · 6 questions · 32 parts · 34 marks

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1(A)1(B)(i)1(B)(ii)1(B)(iii)1(C)(i)1(C)(ii)1(C)(iii)1(D)(i)1(D)(ii)2(A)2(B)(i)2(B)(ii)2(C)(i)2(C)(ii)2(D)(i)2(D)(ii)3(A)3(B)3(C)3(D)4(A)4(B)4(C)4(D)5(A)5(B)5(C)5(D)6(A)6(B)6(C)6(D)

Context for question 5

Figure 1 shows the reactions of the metabolic pathway used to synthesize amino acid B from amino acid A in cells. Figure 1. Synthesis of amino acid B from amino acid A

5(A)Enzymes and Enzyme ActivityEasy1 mark

Describe a characteristic of an enzyme’s active site that allows it to catalyze a specific chemical reaction.

5(B)Proteins: Structure and FunctionEasy1 mark

Based on Figure 1, explain how the binding of amino acid A to enzyme 1 is regulated by amino acid B.

5(C)ATP, Glycogen and Lipid and Amino Acid MetabolismEasy1 mark

Using the information in Figure 1, identify the product of the reaction catalyzed by enzyme 2.

5(D)Enzymes and Enzyme ActivityEasy1 mark

Based on Figure 1, explain how a change in pH could affect enzyme 3 in such a way that amino acid B cannot be produced.