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-QP-Biology-A-6Jun19-AM-pdf
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0 1 . 1 Describe how a non-competitive inhibitor can reduce the rate of an enzyme-controlled reaction. [3 marks
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464317843-7402-1-QP-Biology-A-6Jun19-AM-pdf, Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
A-level
BIOLOGY
Paper 1
Thursday 6 June 2019 Morning Time allowed: 2 hours
Materials
For Examiner’s Use
For this paper you must have:
• a ruler with millimetre measurements Question Mark
• a scientific calculator.
1
Instructions 2
• Use black ink or black ball-point pen. 3
• Fill in the boxes at the top of this page. 4
• Answer all questions.
• You must answer the questions in the spaces provided. Do not write 5
outside the box around each page or on blank pages. 6
, 2
Do not write
outside the
Answer all questions in the spaces provided. box
0 1 . 1 Describe how a non-competitive inhibitor can reduce the rate of an
enzyme-controlled reaction.
[3 marks]
, 3
Do not write
outside the
Pectin is a substance found in some fruit and vegetables. box
A scientist investigated the effect of pectin on the hydrolysis of lipids by a lipase
enzyme.
His results are shown in Figure 1.
Figure 1
0 1 . 2 The scientist concluded that pectin is a non-competitive inhibitor of the lipase enzyme.
Use Figure 1 to explain why the scientist concluded that pectin is a non-competitive
inhibitor.
[1 mark]
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