shows diagrammatically the action of enzymes on two different food molecules. action of enzyme action of enzyme G fat starch molecule D molecules E molecules F Identify the molecules shown in . D E F Identify enzyme G. It has been found that fresh pineapple contains an enzyme that can be used to make meat more tender. Explain why the pineapple is placed on the meat a few hours before, rather than during, cooking. Suggest the name of the enzyme and how it tenderises the meat.

5090_s08_qp_2

THEORY

2008

Paper 2, Variant 0

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shows the effect of temperature on the activity of enzyme E. rate of activity / arbitrary units enzyme E temperature / °C enzyme E State the optimum temperature for enzyme E. Suggest a possible identity for enzyme E, where it is found, and its function. identity of enzyme E where it is found function shows the effect of temperature on the activity of another enzyme, F. rate of activity / arbitrary units enzyme F temperature / °C enzyme F

5090_s12_qp_22

THEORY

2012

Paper 2, Variant 2

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The diagram represents the ‘lock and key’ mechanism of an enzyme that works best at pH 7. enzyme substrate What shows the enzyme and its substrate at pH 13?

5090_s14_qp_12

MCQ

2014

Paper 1, Variant 2

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The diagrams represent an enzyme molecule and its substrate. Which diagram shows these molecules after they are heated to 100 oC?

5090_w06_qp_1

MCQ

2006

Paper 1, Variant 0

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Explain what is meant by the lock and key hypothesis for enzyme action. Describe how enzyme action is affected by an increase in temperature.

5090_w12_qp_22

THEORY

2012

Paper 2, Variant 2

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Describe and explain how each of the following affects enzyme activity: pH, temperature. Name one enzyme that acts in a named part of the alimentary canal and describe the role of this enzyme in digestion.

5090_w18_qp_21

THEORY

2018

Paper 2, Variant 1

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Protease enzyme breaks down protein to amino acids. In the ‘lock and key’ hypothesis, what is the lock and what is the key?

5090_s05_qp_1

MCQ

2005

Paper 1, Variant 0

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Starch is digested to maltose by the enzyme amylase. According to the ‘lock and key’ hypothesis, which is the ‘key’ and which is the ‘lock’?

5090_s06_qp_1

MCQ

2006

Paper 1, Variant 0

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Starch is digested to maltose by the enzyme amylase. According to the ‘lock and key’ hypothesis, which is the ‘key’ and which is the ‘lock’?

5090_s12_qp_11

MCQ

2012

Paper 1, Variant 1

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Starch is digested to maltose by the enzyme amylase. According to the ‘lock and key’ hypothesis, which is the ‘key’ and which is the ‘lock’?

5090_s12_qp_12

MCQ

2012

Paper 1, Variant 2

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