Section 3. Enzymes for Biology, A Level - revisedeck

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3. Enzymes

A section of Biology, 9700

Listing 10 of 276 questions

The Michaelis–Menten constant, Km, is the substrate concentration at which an enzyme works at half its maximum rate. What is correct when the Km value is low?

9700_w22_qp_12

MCQ

2022

Paper 1, Variant 2

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Some molecules fluoresce when illuminated with ultraviolet light. Changes in the structure or shape of such molecules can change the intensity of the fluorescence. The enzyme tryptophan synthase fluoresces bluish-green because of a phosphate group associated with the active site. The enzyme catalyses the reaction shown...

9700_w22_qp_13

MCQ

2022

Paper 1, Variant 3

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Yeast contains the enzyme catalase which catalyses the breakdown of hydrogen peroxide (H2O2) as shown...

9700_w22_qp_13

MCQ

2022

Paper 1, Variant 3

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The Michaelis–Menten constant, Km, is a measure of the affinity of an enzyme for its substrate. The higher the affinity, the lower the Km. The lower the affinity, the slower the reaction will be. At Km, half the active sites of the enzyme are occupied by the substrate. Which statements about Km are correct?

9700_w22_qp_13

MCQ

2022

Paper 1, Variant 3

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The graph shows how the rate of an enzyme-controlled reaction is affected by the change in temperature. All other variables were standardised. rate of reaction temperature region X What is the factor limiting the rate in region X?

9700_w23_qp_11

MCQ

2023

Paper 1, Variant 1

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How will the removal of a reversible non-competitive enzyme inhibitor affect an enzyme-catalysed reaction?

9700_w23_qp_11

MCQ

2023

Paper 1, Variant 1

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The graph shows the effect of an enzyme on a reaction. substrate transition state product energy of system time Z Y X Which row identifies X, Y and Z?

9700_w23_qp_12

MCQ

2023

Paper 1, Variant 2

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The graph shows the results of two experiments on the effect of increasing substrate concentration on the rate of an enzyme-catalysed reaction. One experiment was at a high concentration of enzyme and the second was at a low concentration of enzyme. All other variables were standardised. initial rate of reaction substrate concentration high enzyme concentration low enzyme concentration X What would limit the initial rate of reaction at point X?

9700_w23_qp_12

MCQ

2023

Paper 1, Variant 2

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Which statements about the Michaelis–Menten constant (Km) of an enzyme are correct?

9700_w23_qp_12

MCQ

2023

Paper 1, Variant 2

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Influenza virus has an enzyme called neuraminidase which breaks down glycoproteins in the surface membrane of the cell that the virus will infect. The glycoprotein binds to the active site of neuraminidase by induced fit. Which statements about the induced fit hypothesis of enzyme action are correct?

9700_w23_qp_13

MCQ

2023

Paper 1, Variant 3

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Questions Discovered

276