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6 marksStructure and Roles of Nucleic Acids

CAPE Biology Unit 1 · 2012 · Paper 2 · Question 2(a)(i)

Figure 2 illustrates the main steps in DNA replication in eukaryotes, where a DNA molecule produces two identical copies.

Give a concise description of the events occurring at the steps labelled 1, 2 and 3 in Figure 2.

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Other parts of this question

  1. 2(a)(ii)DNA replication is regarded as being semi-conservative. Comment on the significance of this method of replication.[2 marks]
  2. 2(b)(i)With reference to average beak depth (indicated by the broken line in Figure 3) and nature of the frequency distributions of the two populations, determine…[4 marks]
  3. 2(b)(ii)With the aid of a simple diagram, comment on the type of selection illustrated by the data shown in Figure 3.[3 marks]

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