Quelpr
5 marksMembrane Structure and Function

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

Mechanisms of transport across cell membranes.

Outline a suitable procedure for investigating the tonicity of the three unknown solutions using the provided apparatus and materials (red onion, water, scalpel, distilled water, dropper, forceps, glass slides, coverslip, depression slide/watch glass, light microscope, three unknown solutions, labels).

The mark scheme is shown once you've answered.

Practise this question

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]
  4. 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]
  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]

More practice: the rest of this paper · more Membrane Structure and Function questions · all CAPE Biology Unit 1 past papers