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2 marksCell Structure and Functions

CAPE Biology Unit 1 · 2008 · Paper 2 · Question 4(a)(ii)

According to the endosymbiont theory, mitochondria and chloroplasts are organelles which are thought to have evolved from prokaryotes, and which established symbiotic relationships with eukaryotic cells.

Define the term 'symbiosis'.

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  1. 4(a)(i)Describe TWO features of mitochondria and chloroplasts that support the theory that they have evolved from prokaryotic cells.[2 marks]
  2. 4(a)(iii)Comment on evidence that supports the theory that a symbiotic relationship existed between eukaryotic cells and chloroplasts and mitochondria. Include in your…[4 marks]
  3. 4(b)(i)Define the terms 'tissue' and 'organ'.[2 marks]
  4. 4(b)(ii)Use the dicotyledonous root to distinguish between the levels of organization found in tissues and organs.[5 marks]

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