Cambridge IGCSE Biology
4.1Biological molecules
Biological molecules in Cambridge IGCSE Biology: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic51 practice questions3 lessons
Overview
DNA structure is Supplement.
Learning objectives
What the syllabus expects you to be able to do.
- 4.1.1State which elements carbohydrates, fats and proteins contain.
- 4.1.2State that starch, glycogen and cellulose are made from glucose, proteins from amino acids, and fats and oils from fatty acids and glycerol.
- 4.1.3Describe the iodine, Benedict's, biuret, ethanol emulsion and DCPIP tests for starch, reducing sugars, proteins, fats and oils, and vitamin C.
- 4.1.4Supplement: describe DNA as two strands coiled into a double helix, held together by bonds between pairs of bases that always pair A with T and C with G.
Lessons
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Carbohydrates, proteins and lipids
22 min
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Food tests
25 min
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Nucleic acids and the structure of DNA
22 min
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Sample question
A sample question on this topic. Answer it, check it, then read the worked answer.
Turn Biological molecules into a strength.
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