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1.3 Enzymes

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Question 22
H

A fixed quantity of starch is completely broken down in 120 s at pH 5 and in 75 s at pH 6. All other conditions are the same.

What is the percentage increase in the mean reaction rate from pH 5 to pH 6?

[1]
A

60.0%60.0\%60.0%

B

37.5%37.5\%37.5%

C

62.5%62.5\%62.5%

D

160.0%160.0\%160.0%

Markscheme

1.3 Enzymes Questions

  1. GCSE
  2. /Biology
  3. /1.3 Enzymes

44 exam-style questions on Edexcel GCSE Biology 1.3 Enzymes, covering 1.3.1 Mechanism of enzyme action, 1.3.2 Denaturation of enzymes, 1.3.3 Factors affecting enzyme activity, and 1.3.4 Measuring energy in food by calorimetry. Each one has a worked solution and a mark scheme showing where the marks go.

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