Either Explain what is meant by an enzyme. Describe and explain how pH and temperature affect enzyme activity. Or Describe chlorophyll, a chloroplast. Describe and explain how temperature and light intensity affect the rate of photosynthesis.

5090_s05_qp_2

THEORY

2005

Paper 2, Variant 0

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An experiment was set up to investigate the effect of an enzyme on coagulated egg albumen. The results, after three hours, are shown...

5090_s08_qp_1

MCQ

2008

Paper 1, 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 how an enzyme molecule changes in shape. What explains this change?

5090_s13_qp_11

MCQ

2013

Paper 1, Variant 1

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A bacterium lives in hot springs at temperatures of 75 °C to 85 °C. Which graph represents the activity of enzymes found in these bacteria?

5090_s14_qp_11

MCQ

2014

Paper 1, Variant 1

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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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The graph shows how the rate of reaction of a protease from the stomach varies with pH. rate of reaction X pH What describes the pH at point X?

5090_s22_qp_11

MCQ

2022

Paper 1, Variant 1

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A dilute starch solution turns blue when very dilute iodine solution is added. This colour disappears as the starch is broken down by amylase. The graph shows the disappearance of the blue colour at different temperatures. 10 20 30 40 50 60 70 temperature / °C time for blue colour to disappear / minutes Which statement explains the shape of the curve?

5090_s22_qp_11

MCQ

2022

Paper 1, Variant 1

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Amylase is an enzyme that breaks down starch to maltose. Students set up an experiment to investigate the effect of different temperatures on the action of amylase on starch solution. They measured the amount of starch remaining after 30 minutes at different temperatures. Which graph would you expect the students to draw from their results?

5090_s22_qp_12

MCQ

2022

Paper 1, Variant 2

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Which statement identifies the optimum temperature for enzyme activity?

5090_s22_qp_12

MCQ

2022

Paper 1, Variant 2

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