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4 marksMembrane Structure and Function

CAPE Biology Unit 1 · May/June 2019 · Paper 2 · Question 1(b)(iii)

Figure 2 shows the rate of uptake of Substance A and Substance B across a lipid bilayer with increasing concentration.

Compare and contrast the two types of diffusion identified in (b)(ii).

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Other parts of this question

  1. 1(a)(i)Construct a tissue diagram from the light micrograph of the plant section in Figure 1.[3 marks]
  2. 1(a)(ii)Provide annotations to describe EACH labelled structure, A–E in Figure 1.[5 marks]
  3. 1(b)(i)Describe the changes in the rate of uptake of Substance A and Substance B as solute concentration increases as depicted in Figure 2.[2 marks]
  4. 1(b)(ii)Identify the types of diffusion illustrated for Substance A and Substance B in Figure 2.[2 marks]
  5. 1(b)(iv)Arrange CO2, glucose, water, and RNA in order of ability to diffuse through a lipid bilayer, starting with the easiest, and explain the order.[6 marks]
  6. 1(c)With the aid of an annotated diagram, explain the organization of membrane lipids, and discuss the structure of a cell membrane specifying lipid organization…[8 marks]

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