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B2 4
Summary sheet

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Answers to summary questions
Answers
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…

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B2 4


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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…

Page 3

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B2 4


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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…

Page 4

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B2 4


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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…

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