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3 marksAspects of Biochemistry

CAPE Biology Unit 1 · 2016 · Paper 2 · Question 1(a)(iii)

Figure 1 illustrates the formation of sucrose from glucose and fructose, with intermediate R and product X.

With reference to the molecular structure of sucrose, explain why sucrose has an advantage over glucose as a transport sugar in plants.

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Other parts of this question

  1. 1(a)(i)Name the reaction labelled R and the reaction product labelled X in Figure 1.[2 marks]
  2. 1(a)(ii)In the box below, illustrate the full molecular ring structure of the glucose molecule involved in the reaction in Figure 1.[2 marks]
  3. 1(b)(i)Draw a simple labelled diagram to illustrate the fluid mosaic model of plasma membrane structure.[5 marks]
  4. 1(b)(ii)With reference to the fluid mosaic model, explain how large polar molecules can pass through the membrane.[3 marks]

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