Lesson 5.5.1
5.5.1 Effect of temperature on enzyme activity Quiz: Pearson Edexcel Biology, Unit 5
20 questions
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Lesson 5.5.1, Effect of temperature on enzyme activity: 20 multiple choice questions for the Pearson Edexcel Biology (9BI0), Unit 5: On the Wild Side, written with Revision Ninja.
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The 20 questions
-
Why does reaction rate increase with temperature below an enzyme's optimum temperature?
- Higher kinetic energy
- Lower activation energy
- Lower collision frequency
- Active site denaturation
-
What happens to an enzyme's active site when exposed to temperatures above optimum?
- It compresses
- It denatures
- It crystallises
- It duplicates
-
What does the temperature coefficient, Q10, measure for an enzyme-catalysed reaction?
- Rate increase factor
- Activation energy value
- Enzyme saturation point
- Optimum temperature value
-
The rate of a reaction at 10 degrees C is 2 units per minute and at 20 degrees C is 8 units per minute. What is Q10?
- 4
- 6
- 2
- 10
-
The rate at 15 degrees C is 3 and at 25 degrees C is 6 for a reaction. What is Q10?
- 0.5
- 1
- 3
- 2
-
A reaction has Q10 = 2. The rate at 20 degrees C is 5 units. What is the rate at 30 degrees C?
- 2.5 units
- 25 units
- 7 units
- 10 units
-
What causes reaction rate to roughly double for every 10 °C temperature rise below optimum?
- Enzyme denaturation
- Increased substrate concentration
- Increased kinetic energy
- Decreased activation energy
-
What type of variable is temperature when investigating its effect on enzyme activity?
- Independent variable
- Confounding variable
- Control variable
- Dependent variable
-
Why might an enzyme reaction rate decrease when temperature increases from 30 °C to 40 °C?
- Enzyme denaturation
- Substrate saturation
- Increased activation energy
- Competitive inhibition
-
Why does an enzyme-catalysed reaction rate plateau at very high substrate concentrations?
- Substrate completely used
- Enzyme fully denatured
- Active sites saturated
- Activation energy depleted
-
What does a Q10 temperature coefficient value measure in a biological process?
- Activation energy
- Temperature sensitivity
- Denaturation point
- Optimum temperature
-
What happens to bacterial enzymes when temperatures rise significantly above their optimum?
- They multiply
- They denature
- They activate
- They hydrolyse
-
An enzyme reaction rate peaks at 40 °C and falls at 50 °C. What is 40 °C?
- Activation temperature
- Critical temperature
- Optimum temperature
- Denaturation temperature
-
Why are substrate and enzyme concentrations kept constant during a temperature investigation?
- To calculate Q10
- To increase rate
- To control variables
- To denature enzymes
-
Why does temperature directly affect metabolic rate in all living organisms?
- Membranes become rigid
- Organisms lack water
- DNA degrades rapidly
- Enzymes control metabolism
-
A reaction's rate doubles for every 10 degree rise. What does this indicate about its Q10?
- Q10 is 1
- Q10 is 0.5
- Q10 is 10
- Q10 is 2
-
What does a Q10 temperature coefficient of 1 indicate about a chemical reaction?
- Rate doubles
- Rate halves
- Temperature independent
- Enzyme denatures
-
How does raising temperature below the optimum affect enzyme activity?
- Decreases kinetic energy
- Increases reaction rate
- Denatures active sites
- Inactivates enzymes permanently
-
What is the dependent variable when investigating the effect of temperature on seedling development?
- Growth rate
- Incubation period
- Water temperature
- Light intensity
-
What temperature interval is required between two measured rates to calculate Q10?
- 10 °C
- 20 °C
- 1 °C
- 5 °C
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