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

Enzymes are essential for digestion by converting large molecules into smaller ones.

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]

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Paper 3Theory (Core)2 marks

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
Aim for approximately 1 distinct marking point.
[1]
b
State the products formed when lipase acts on fats and oils.
Your answer
Aim for approximately 1 distinct marking point.
[1]