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3 marksMembrane Structure and Function

CAPE Biology Unit 1 · 2012 · Paper 2 · Question 1(b)(ii)

Table 2 presents data on water potential changes over an 18-hour period, starting at 0400 hours (4:00 a.m.), in the leaves of a shrub growing in dry conditions.

Account for the shape of the graph. Include in your account a brief description of the shape of the graph.

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Other parts of this question

  1. 1(a)Complete Table 1 by writing the missing information in the spaces provided.[3 marks]
  2. 1(b)On the grid provided on page 3, plot the data in Table 2 as a line graph.[5 marks]
  3. 1(c)Identify the structures labelled A and B in Figure 1.[2 marks]
  4. 1(c)(ii)Label an ester linkage in the triglyceride shown in Figure 1.[1 mark]
  5. 1(c)(iii)State ONE feature of the triglyceride molecule that enables it to function as a better energy store than carbohydrates.[1 mark]

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