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Course: AQA A Level Biology 7402
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AQA A Level Biology 7402

1. Biological Molecules

0/102

2. Cell Structure

0/95

3. Exchange and Transport

0/98

4. Genetics, Variation and Interdependence

0/94

5. Energy Transfers In and Between Organisms (A Level only)

0/63

6. Organisms Respond to Changes in their Environments (A Level only)

0/93

7. Genetics, Populations, Evolution and Ecosystems (A Level only)

0/55

8. The Control of Gene Expression (A Level only)

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9. Exam Guidance and Skills

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Quiz

1.4.7 Limiting Factors Affecting Enzymes- Temperature – Exam questions

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  • Questions count: 12
  • Passing grade: B+
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1.

Above the optimum temperature, an enzyme

works faster indefinitely
is denatured
becomes a substrate
is unchanged
2.
Why should enzyme and substrate be brought to the test temperature before mixing?
To denature the enzyme
So the reaction runs at the intended temperature from the start
To use up the substrate
To increase activation energy
3.
What happens to an enzyme above its optimum temperature?
It works faster forever
It becomes denatured
It changes substrate
It becomes a carbohydrate
4.
Why does a high temperature denature enzymes?
Peptide bonds are hydrolysed
Hydrogen and ionic bonds break, changing the active site
Substrate becomes too fast to bind
The enzyme evaporates
5.
Why does enzyme activity fall sharply at high temperatures?
Substrate molecules move slower
Activation energy increases
The enzyme denatures as bonds holding its shape break
ATP runs out
6.
At low temperatures, enzyme activity is slow because:
There is no substrate
The active site is destroyed
Molecules have less kinetic energy
The enzyme is denatured
7.
Raising the temperature far above an enzyme's optimum usually
denatures the enzyme and lowers the rate
increases the rate without limit
changes the substrate into an enzyme
has no effect
8.
Over the interval measured, at what temperature does enzyme 2 appear to have its optimal efficiency? (see the figure)
Over the interval measured, at what temperature does enzyme 2 appear to have its optimal efficiency? (see the figure)
10 C
15 C
20 C
25 C
30 C
9.
From the same kind of enzyme graph (peak at 40 °C), at which temperature was the rate highest?
Dr Dabour Hub Academy - figure 1
60 °C
40 °C
10 °C
50 °C
10.
What happens to an enzyme at a very high temperature?
It works faster forever
It becomes a substrate
Nothing
Its active site changes shape and it is denatured
11.
The temperature at which an enzyme works fastest is its __________ temperature.
denaturing
minimum
boiling
optimum
12.
In a test of how pH affects enzyme activity, keeping temperature the same makes it a _____.
dependent variable
constant
hypothesis
control group
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Part of 1. Biological Molecules — see every lesson and quiz in this unit.
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