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3 marksMembrane Structure and Function

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

Mechanisms of transport across cell membranes.

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.

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Other parts of this question

  1. 1(a)(i)List FOUR properties of water which are important to life processes.[4 marks]
  2. 1(a)(ii)Describe how TWO properties of water are aided by the hydrogen bonding between water molecules.[4 marks]
  3. 1(b)(i)Define the term 'simple diffusion'.[2 marks]
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  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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