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1.3 Enzymes

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Question 32
H

A student samples an amylase–starch mixture every 10 s. The iodine test is blue-black at 40 s and is first orange-brown at 50 s.

Let t t\,t be the time when the starch disappeared, and calculate relative rate as 1/t1/t1/t.

Which range contains the relative rate?

[1]
A

0.020<rate≤0.025 s−10.020<\text{rate}\leq0.025\,\mathrm{s^{-1}}0.020<rate≤0.025s−1

B

0.025≤rate<0.033 s−10.025\leq\text{rate}<0.033\,\mathrm{s^{-1}}0.025≤rate<0.033s−1

C

0.017<rate≤0.020 s−10.017<\text{rate}\leq0.020\,\mathrm{s^{-1}}0.017<rate≤0.020s−1

D

0.020≤rate<0.025 s−10.020\leq\text{rate}<0.025\,\mathrm{s^{-1}}0.020≤rate<0.025s−1

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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