Cambridge IGCSE Biology practice

Paper 3 structured question: Chemical digestion

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Paper

Marks

Topic

Chemical digestion

Exam-style question

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Paper 3Theory (Core)2 marks

Digestive enzymes help break down food into smaller molecules that the body can absorb.

Description

Amylase converts starch into simple sugars. Proteases convert proteins into amino acids. Lipase converts fats and oils into fatty acids and glycerol.

a
Describe the role of amylase in digestion.
Your answer
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[1]
b
State the products formed when lipase acts on fats and oils.
Your answer
Aim for approximately 1 distinct marking point.
[1]

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Paper 3Theory (Core)2 marks

Description

Proteases convert proteins into amino acids during digestion.

a
Identify the enzyme that converts proteins into amino acids.
Your answer
Aim for approximately 1 distinct marking point.
[1]
b
Describe what happens to starch when amylase acts on it.
Your answer
Aim for approximately 1 distinct marking point.
[1]