Enzymes

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B2 4
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1 a) oxygen; glucose; energy; respiration; dioxide; water.
b) glucose + oxygen energy + carbon dioxide + water.
c) It provides the energy needed for synthesis reactions, muscle contraction
and maintaining body temperature.
d) The mitochondria are organelles that are the site of the reactions involved
in aerobic respiration. They have a large internal surface area and many
enzymes.
2 Marks awarded for relevant scientific points and clear expression.
Teaching notes
The questions are designed to crystallise knowledge and are not designed to be
exam style. This format is particularly useful for students who have difficulty
answering questions without some kind of writing frame.
AQA Science © Nelson Thornes Ltd 2006 B2 4 1

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B2 4
Continued ...
Enzymes
1 a) Box A = oxygen (1 mark)
Box B = water (1 mark)
b) i) To build up larger molecules from smaller ones. (1 mark)
To enable muscles to contract. (1 mark)
ii) To maintain a steady/constant body temperature. (1 mark)
iii) Used to build up sugars, nitrates and other nutrients into
amino acids and then proteins.…read more

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B2 4
Continued ...
c) The small intestine (1 mark)
d) · Neutralises the acid (added to the food in the stomach).
· Provides neutral/alkaline conditions for enzymes to
function/optimum pH for enzymes.
· Emulsifies fats/breaks up fats into small droplets.
· Increases the surface area of fats (so that enzymes can work
on them more effectively). Allow any accurate description of
emulsification.…read more

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B2 4
Continued ...
work at low or atmospheric pressures / need less expensive equipment 1
(ii) any two from: 2
· easily broken down by high temperature / low pH
· difficult to separate from water-soluble products
· very expensive to buy
(b) (i) lipase 1
(ii) isomerase 1
(iii) protease 1
[7]
2.…read more

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