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2 marksCellular Respiration and ATP Synthesis

CAPE Biology Unit 2 · 2003 · Paper 1 · Question 2(c)

Yeast growing in a mixture of grapes and sugar metabolizes the sugar, initially increasing in number, but after a few days the population declines and dies despite remaining carbohydrates.

Suggest TWO reasons for this decline in yeast population.

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Other parts of this question

  1. 2(a)(i)State which molecule accepts the 2H from NADH2 during anaerobic respiration in animals.[1 mark]
  2. 2(a)(ii)State the product of anaerobic respiration in animals.[1 mark]
  3. 2(a)(iii)State TWO products produced under similar anaerobic conditions in plants.[2 marks]
  4. 2(b)In animals, explain what happens to the product formed during anaerobic respiration when oxygen becomes available again.[2 marks]
  5. 2(d)State TWO advantages of using natural enzymes rather than an inorganic catalyst to catalyse the breakdown of carbohydrate solutions.[2 marks]

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