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3 marksCellular Respiration and ATP Synthesis

CAPE Biology Unit 2 · May/June 2026 · Paper 2 · Question 1(b)(i)

Figure 2 shows a type of anaerobic respiration which occurs in some marine organisms where an amino acid and pyruvate are converted into a new molecule known as an opine.

State THREE ways in which lactic acid fermentation and the method of anaerobic respiration shown in Figure 2 are similar.

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Other parts of this question

  1. 1(a)(i)On the diagram in Figure 1, insert the names of the FIVE intermediates shown.[5 marks]
  2. 1(a)(ii)Identify which TWO of the reactions, labelled W–Z, uses ATP.[2 marks]
  3. 1(a)(iii)State the total number of NADH and pyruvate molecules produced from a single glucose molecule during glycolysis.[2 marks]
  4. 1(b)(ii)State the name of the two-carbon molecule which is produced during oxidative decarboxylation of pyruvate.[1 mark]
  5. 1(c)(iii)On the grid provided on page 7, construct a bar graph that shows a comparison between both strains of yeast at the given temperatures.[5 marks]
  6. 1(c)(iv)State TWO conclusions which can be made from the data given in Table 1. You MUST give a reason to support EACH conclusion.[4 marks]
  7. 1(c)Discuss TWO ways in which global warming may impact the mangrove ecosystem shown in Figure 3. You MUST present your response in complete paragraphs.[8 marks]

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