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6 marksCellular Respiration and ATP Synthesis

CAPE Biology Unit 2 · 2009 · Paper 2 · Question 1(a)

An experiment investigates the rate of oxygen uptake by germinating peas at room temperature using a respirometer.

Explain how the apparatus shown in Figure 1 is used to investigate the rate of oxygen uptake of the germinating peas in the respirometer.

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Other parts of this question

  1. 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]
  2. 1(c)(i)On Figure 2, label EACH of the stages with C to indicate decarboxylation reactions and H to indicate dehydrogenation reactions.[5 marks]
  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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