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3 marksCell Structure and Functions

CAPE Biology Unit 1 · 2016 · Paper 2 · Question 4(a)(i)

According to the endosymbiotic theory, organelles like mitochondria and chloroplasts are believed to have evolved from prokaryotes.

Explain what is meant by the term 'endosymbiosis' and how it relates to the origin of these organelles in eukaryotes.

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  1. 4(a)(ii)Discuss THREE lines of evidence in support of this theory.[6 marks]
  2. 4(b)Enzymes are globular proteins and are highly specific in the reactions catalysed. Explain the basis of enzyme specificity and include in your explanation a…[6 marks]

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