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8 marksMembrane Structure and Function

CAPE Biology Unit 1 · 2007 · Paper 2 · Question 5(b)(i)

The role of the membrane is to control the movement of substances. Clarify how this is done for EACH of the following:

Entry of useful minerals, such as potassium

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Other parts of this question

  1. 5(a)Describe the structure of the membrane of a typical cell, and identify its component parts and their biochemical nature.[6 marks]
  2. 5(b)(ii)Absorption of large molecules by endocytosis[1 mark]
  3. 5(b)(iii)Entry of non-ionic molecules such as sucrose[1 mark]
  4. 5(b)(iv)Prevention of entry of toxic molecules such as copper or lead[1 mark]
  5. 5(c)When strips of potato tissue are immersed in distilled water for two hours, they increase in length and become turgid. Relate this outcome to the exact causes…[6 marks]

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