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5 marksCellular Respiration and ATP Synthesis

CAPE Biology Unit 2 · 2009 · Paper 2 · Question 1(c)(i)

A simplified diagram of the Krebs cycle and preceding reactions is provided.

On Figure 2, label EACH of the stages with C to indicate decarboxylation reactions and H to indicate dehydrogenation reactions.

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Other parts of this question

  1. 1(a)Explain how the apparatus shown in Figure 1 is used to investigate the rate of oxygen uptake of the germinating peas in the respirometer.[6 marks]
  2. 1(b)State ONE way in which the apparatus in Figure 1 could be modified to determine the effect of temperature on oxygen uptake by germinating peas.[1 mark]
  3. 1(c)(ii)State EXACTLY where the Krebs cycle occurs in a cell.[1 mark]
  4. 1(c)(iii)Briefly explain the role of NAD in the Krebs cycle, in relation to energy production.[2 marks]

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