plumiLink reaction and Krebs cycle: Edexcel International A Level Biology questions
Edexcel International A Level Biology past-paper questions on 7.1.3 Link reaction and Krebs cycle, 2019–2025, with mark schemes and examiner’s reports where available.
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Q7(b)(iii)
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Open the full PDFYour answerQ7(c)
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Open the full PDFQ2(a)(iii)
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Open the full PDFYour answerQ7(b)(ii)
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Open the full PDFQ5(a)(i)
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Open the full PDFYour answerQ1(a)
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Open the full PDFYour answerQ1(b)(ii)
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All 9 questions on Link reaction and Krebs cycle, as a list
- January 2025, Unit 5, Q7(b)(iii) (1 mark): Which molecule is required in the conversion of pyruvate to a 2 carbon compound in the link reaction of respiration? (1) A oxidised NAD B oxidised NADP C reduce
- January 2025, Unit 5, Q7(c) (2 marks): Name three products of Krebs cycle. (2)
- June 2023, Unit 5, Q2(a)(iii) (2 marks): Describe the role of reduced NAD in aerobic respiration. (2)
- June 2022, Unit 5, Q7(b)(i) (1 mark): Which is the approximate rate at which carbon dioxide is produced in sample 1? (1) A 3 nmol mg min B 180 nmol mg min C 3 nmol mg–1 min–1 D 180 nmol mg–1 min–1
- June 2022, Unit 5, Q7(b)(ii) (4 marks): Explain the results of this investigation. Use the information in the table and your own knowledge of the Krebs cycle to support your answer. (4)
- October 2021, Unit 5, Q5(a)(i) (1 mark): Which row of the table shows the location of each stage? (1) Glycolysis Link reaction Krebs cycle A cytoplasm cytoplasm cytoplasm B cytoplasm mitochondrial matr
- June 2021, Unit 5, Q1(a) (3 marks): One product of all three stages shown in the table is ATP (adenosine triphosphate). Complete the table to show one other product of each stage. (3) Stage One ot
- October 2020, Unit 5, Q1(b)(i) (1 mark): How do respiratory substrates enter the Krebs cycle? (1) A as molecules containing 2 carbon atoms produced by the link reaction B as molecules containing 3 carb
- October 2020, Unit 5, Q1(b)(ii) (2 marks): Draw a diagram of a mitochondrion. Label only the part of the mitochondrion where the Krebs cycle occurs. (2)
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