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4 marksCellular Respiration and ATP Synthesis

CAPE Biology Unit 2 · 2018 · Paper 2 · Question 1(a)(iii)

An outline of the Krebs cycle is shown with compounds labelled A to G and selected stages numbered 1 to 5.

Explain the TWO MAIN roles of the Krebs cycle.

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Other parts of this question

  1. 1(a)(i)Writing your answer in Figure 1, insert the number of carbon atoms contained in EACH of the compounds labelled B to G (example provided for Compound A).[3 marks]
  2. 1(a)(ii)Writing your answer in Figure 1, insert the input and product at the point numbered 4, as completed for points 1, 2, 3 and 5.[1 mark]
  3. 1(b)(i)On the grid provided on page 7, plot a line graph based on the data provided in Table 1.[4 marks]
  4. 1(b)(ii)Using the concept of limiting factors, suggest THREE reasons for the shape of the graph drawn in b (i).[3 marks]

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