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Cambridge AS & A Level Biology 9700 — Revision Notes

1 · Cell Structure

0/26

2 · Biological Molecules

0/51

3 · Enzymes

0/29

4 · Cell Membranes and Transport

0/41

5 · The Mitotic Cell Cycle

0/21

6 · Nucleic Acids and Protein Synthesis

0/22

7 · Transport in Plants

0/28

8 · Transport in Mammals

0/39

9 · Gas Exchange

0/13

10-11 · Infectious Disease and Immunity

0/43

12 · Energy and Respiration

0/37

13 · Photosynthesis

0/23

14-15 · Homeostasis and Control

0/57

16 · Inherited Change

0/33

17-18 · Selection, Evolution, Classification and Conservation

0/70

19 · Genetic Technology

0/44
Quiz

3.1 Mode of Action of Enzymes – Check yourself

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Mode of Action of Enzymes AS Biology check yourself quiz: free practice for AS Biology. Work through this Mode of Action of Enzymes AS Biology check yourself quiz and get instant feedback on every answer. If you get stuck, review the 3.1 Mode of Action of Enzymes — AS Biology Notes lesson. More practice: AS Biology — all units. Syllabus: Cambridge AS & A Level Biology 9700 syllabus.

  • 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.

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
4.

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
5.

An extracellular enzyme is one that

works in the nucleus
is never released
is a lipid
is secreted and acts outside the cell
6.

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
7.

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
8.

A colorimeter can be used in enzyme investigations to

measure temperature
measure pH
measure the absorbance of a coloured solution
count molecules
9.

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
10.

Catalase catalyses the breakdown of

starch to maltose
protein to amino acids
hydrogen peroxide to water and oxygen
lipids to fatty acids
11.
The region of an enzyme where the substrate binds is the
cofactor
active site
product site
allosteric site only
12.
The part of an enzyme where the substrate binds is the:
Membrane
Active site
Nucleus
Product
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Part of 3 · Enzymes — see every lesson and quiz in this unit.
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