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2 marksEnzymes

CAPE Biology Unit 1 · 2006 · Paper 2 · Question 5(c)(ii)

The enzyme pepsin digests protein in the stomach where hydrochloric acid maintains the contents at an optimum pH of between 1 and 3. The pancreas secretes alkaline bicarbonate ions into the duodenum.

Giving ONE reason, predict the effect that the addition of these bicarbonate ions will have on pepsin action as the stomach contents pass into the duodenum.

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Other parts of this question

  1. 5(a)With reference to the structure of enzymes, distinguish between competitive and non-competitive enzyme inhibition.[4 marks]
  2. 5(b)Describe the steps involved in an enzyme-catalysed reaction. In your description, make reference to the active site of an enzyme-substrate complex, lowering of…[6 marks]
  3. 5(c)(i)Giving ONE reason, predict the effect that baking the bread over 110°C will have on enzyme activity.[2 marks]
  4. 5(c)(iii)Giving ONE reason, predict the effect that the new weight of xylanase will have on the clarification process.[2 marks]
  5. 5(c)(iv)Giving ONE reason, predict the effect that this shortage will have on the clarification process.[2 marks]
  6. 5(c)(v)Giving ONE reason, predict what would occur if xylanase were used to clarify fresh sugar cane juice.[2 marks]

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