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3 marksPhotosynthesis and ATP Synthesis

CAPE Biology Unit 2 · 2012 · Paper 2 · Question 1(a)(ii)

Figure 1 shows an incomplete diagram summarising the main steps in the Calvin cycle.

Outline the MAIN purpose of EACH of the three main phases of the Calvin cycle shown by the pie sections in Figure 1: - First phase - Second phase - Third phase

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Other parts of this question

  1. 1(a)(i)a)On Figure 1, use a labelled arrow to indicate the stages at which ATP is used and ADP released, including the number of molecules involved.[1.5 marks]
  2. 1(a)(i)b)On Figure 1, use a labelled arrow to indicate the stage at which NADPH is used and NADP+ released, including the number of molecules involved.[1.5 marks]
  3. 1(a)(iii)State ONE difference between the Calvin cycle and Krebs cycle (do NOT state the site of pathways as a difference).[2 marks]
  4. 1(b)(i)Describe the changes in blood lactate and glucose levels over the exercise period for cyclists who used pyruvate supplements.[4 marks]
  5. 1(b)(ii)Account for the trend observed in blood lactate levels during the first 60 minutes of the cycling activity.[2 marks]
  6. 1(b)(iii)Based on the data in Figure 2, suggest what conclusion may be drawn regarding the effect of pyruvate supplements on aerobic performance.[1 mark]

More practice: the rest of this paper · more Photosynthesis and ATP Synthesis questions · all CAPE Biology Unit 2 past papers