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Course: Edexcel A Level Biology A (SNAB) 9BI0
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Edexcel A Level Biology A (SNAB) 9BI0

Topic 1 · Lifestyle, Health and Risk

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Topic 2 · Genes and Health

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Topic 3 · Voice of the Genome

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Topic 4 · Biodiversity and Natural Resources

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Topic 5 · On the Wild Side

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Topic 6 · Immunity, Infection and Forensics

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Topic 7 · Run for your Life

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Topic 8 · Grey Matter

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Quiz

2.3.10 Practical- Investigating the Effect Enzyme and Substrate Concentrations – Exam questions

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  • Questions count: 12
  • Passing grade: B+
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1.
Enzyme concentration was varied with excess substrate. What relationship does the table show?
Rate is directly proportional to enzyme concentration
Rate falls as enzyme increases
Rate is unaffected
Rate levels off immediately
2.
The part of an enzyme where the substrate binds is the:
Membrane
Active site
Nucleus
Product
3.
Enzyme and substrate fit together like:
A lock and key
A circle and a square
Oil and water
Two magnets
4.

The substrate binds to the enzyme’s

allosteric site only
active site
membrane
nucleus
5.
With a limited amount of chemical substrate, all of the following factors could directly affect an enzyme’s activity EXCEPT
SAT Biology - Question 123
A
B
C
D
E
6.
Rate at different substrate concentrations is shown. Why does the rate level off above 4%?
The enzyme has denatured
The substrate has become the enzyme
All active sites are occupied — the enzyme is saturated
Temperature has fallen
7.
At high substrate concentrations, rate plateaus because
the enzyme is denatured
the substrate is used up
all active sites are occupied
inhibitors form
8.
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
9.

An enzyme–substrate complex is

the product of the reaction
an inhibitor
a coenzyme
the temporary structure formed when a substrate binds to the active site
10.
The region of an enzyme where the substrate binds is the
cofactor
active site
product site
allosteric site only
11.
What is the rate of reaction for the enzyme-substrate interaction shown in the graph below? (see the figure)
What is the rate of reaction for the enzyme-substrate interaction shown in the graph below? (see the figure)
6 micromoles per minute
5 micromoles per minute
4 micromoles per minute
3 micromoles per minute
2 micromoles per minute
12.
A mutation changed a polar amino acid into a nonpolar one far from the active site. How might this alter the enzyme\'s substrate specificity?
A mutation changed a polar amino acid into a nonpolar one far from the active site. How might this alter the enzyme's substrate specificity?
By changing the enzyme pH optimum
By changing the enzyme location in the cell
By changing the shape of the protein
An amino acid change away from the active site cannot alter substrate specificity.
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Part of Topic 2 · Genes and Health — see every lesson and quiz in this unit.
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