Describe how the action of enzymes can be explained by the ‘lock and key’ hypothesis. Describe and explain the effect of a gradual increase in temperature on an enzyme-controlled reaction. You should refer to the ‘lock and key’ hypothesis.

5090_s06_qp_2

THEORY

2006

Paper 2, Variant 0

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X and Y are the reactants in a chemical reaction for which E is the enzyme. The product is Z. The first three stages in the reaction are shown...

5090_s16_qp_11

MCQ

2016

Paper 1, Variant 1

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Enzyme Q is active in the human alimentary canal. shows the effect of pH on the rate of reaction of enzyme Q. pH rate of reaction / arbitrary units Use the information in to name the region of the alimentary canal where enzyme Q is active. ………………………………………………… Use your knowledge of the ‘lock and key’ hypothesis of enzyme action to explain why enzyme Q is active only in this region of the alimentary canal and not in any other region. All enzymes contain carbon. List three other chemical elements that must be present in each molecule of an enzyme.

5090_s16_qp_21

THEORY

2016

Paper 2, Variant 1

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Which property of enzymes is explained by the lock and key hypothesis?

5090_s17_qp_12

MCQ

2017

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In an enzyme’s action, where is the active site and where are the lock and the key?

5090_s18_qp_11

MCQ

2018

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In an enzyme’s action, where is the active site and where are the lock and the key?

5090_s18_qp_12

MCQ

2018

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Which statement about enzymes is not correct?

5090_s19_qp_11

MCQ

2019

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Which graph shows the effect of temperature on the rate of a reaction catalysed by amylase?

5090_s19_qp_12

MCQ

2019

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Which property of enzymes is explained by the lock and key hypothesis?

5090_s20_qp_11

MCQ

2020

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Which substance is an enzyme?

5090_s20_qp_12

MCQ

2020

Paper 1, Variant 2

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