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4 marksAspects of Biochemistry

CAPE Biology Unit 1 · May/June 2024 · Paper 2 · Question 1(a)(ii)

Properties of water and biological importance.

Describe how TWO properties of water are aided by the hydrogen bonding between water molecules.

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  1. 1(a)(i)List FOUR properties of water which are important to life processes.[4 marks]
  2. 1(b)(i)Define the term 'simple diffusion'.[2 marks]
  3. 1(b)(ii)Name the mechanisms by which the molecules move directly from A across the membrane to B, for EACH of the illustrations labelled X–Z in Figure 1.[3 marks]
  4. 1(b)(iii)Outline a suitable procedure for investigating the tonicity of the three unknown solutions using the provided apparatus and materials (red onion, water,…[5 marks]
  5. 1(c)(i)Based on the structure of ergosterol compared with cholesterol shown in Figure 2, suggest the function of ergosterol in the cell membrane of yeast cells.[3 marks]
  6. 1(c)(ii)Explain the functions of the THREE components of the cell membrane of the red blood cell as shown in Figure 3 based on the fluid mosaic model. Present your…[9 marks]

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