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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

0/72

Topic 6 · Immunity, Infection and Forensics

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Topic 7 · Run for your Life

0/55

Topic 8 · Grey Matter

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Quiz

2.3.9 Mode of Enzyme Action – Exam questions

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

Enzymes are

fibrous proteins
lipids
carbohydrates
globular proteins that catalyse metabolic reactions
2.

Enzymes speed up reactions by

lowering the activation energy
raising the activation energy
increasing the temperature
being used up
3.

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
4.

An extracellular enzyme is one that

works in the nucleus
is never released
is a lipid
is secreted and acts outside the cell
5.

The progress of an enzyme-catalysed reaction can be followed by measuring

the rate of formation of product or disappearance of substrate
the mass of enzyme
the colour of the enzyme
the pH only
6.

A colorimeter can be used in enzyme investigations to

measure temperature
measure pH
measure the absorbance of a coloured solution
count molecules
7.

The specificity of an enzyme is due to

its size
its solubility
the shape of its active site, determined by its tertiary structure
its primary structure only
8.

In the induced-fit hypothesis

the substrate is identical in shape to the active site at all times
the enzyme is rigid
the product changes shape
the active site changes shape slightly to fit the substrate more closely
9.

The initial rate of reaction is used for comparisons because

it is the slowest rate
the enzyme is denatured
substrate concentration is not yet limiting
products inhibit the reaction
10.

Catalase catalyses the breakdown of

starch to maltose
protein to amino acids
hydrogen peroxide to water and oxygen
lipids to fatty acids
11.
In the diagram of enzyme action, what is region X?
Dr Dabour Hub Academy - figure 1
The product
The substrate
The active site
The denatured site
12.
Which control shows that the oxygen comes from enzyme action and not the liquid alone?
Hydrogen peroxide with twice the liver
Water with fresh liver at 60 °C
No peroxide and no liver
Hydrogen peroxide with boiled liver
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Part of Topic 2 · Genes and Health — see every lesson and quiz in this unit.
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