CAIE IGCSE Biology 4.1 Biological Molecules Questions
Practise identifying the composition, subunits and test results of key biological molecules and reading simple DNA diagrams.
- Syllabus
- 2026–2028
- Course
- Biology 0610
Exam points
- identify carbohydrates, fats and proteins from their carbon, hydrogen, oxygen and nitrogen content
- match glucose, amino acids, fatty acids and glycerol to the large molecules they form
- interpret iodine, Benedict’s, biuret and DCPIP colour changes to identify food substances
- describe DNA as two strands coiled into a double helix and held by bonds between paired bases
- apply A–T and C–G pairing to complete DNA sequences or calculate missing base percentages
Covered syllabus points
Question 1
[Maximum number: 1]
Antibodies are proteins.
State the chemical elements present in all proteins that are also found in carbohydrates and fats.
carbon, hydrogen, oxygen ;
Question 2
[Maximum number: 1]
Two functions of the alimentary canal are mechanical digestion and chemical digestion.
Substances that are absorbed from the alimentary canal may enter cells and become part of the cells.
State the storage carbohydrate made from glucose in liver cells.
glycogen ;
Question 3
[Maximum number: 1]
What is the test for protein?
name of the test
heat
colour change
Benedict's
yes
blue to purple
biuret
yes
blue to red
biuret
no
blue to purple
Benedict's
no
blue to red
C
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