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Cambridge IGCSE Combined Science practice

Paper 3 structured question: Biological molecules

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Biological molecules

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Paper 3Theory (Core)3 marks

The role of biomolecules in living organisms is vital for understanding biology.

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Functions of Biomolecules

Carbohydrates provide energy, fats store energy and provide insulation, while proteins are essential for growth and repair of tissues.

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    Explain Discuss the importance of each type of biomolecule in living organisms.

    Aim for approximately 3 distinct marking points.

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Paper 3 structured question: Biological molecules

Paper 3Theory (Core)2 marks

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Chemical Composition of Biomolecules

Carbohydrates, fats, and proteins are essential biomolecules made up of specific chemical elements. Carbohydrates primarily consist of carbon (C), hydrogen (H), and oxygen (O). Fats, also known as lipids, are composed of carbon (C), hydrogen (H), and oxygen (O), but in different ratios compared to carbohydrates. Proteins are made up of carbon (C), hydrogen (H), oxygen (O), and nitrogen (N), and sometimes sulfur (S).

  1. a

    Identify List the chemical elements that make up carbohydrates, fats, and proteins.

    Aim for approximately 2 distinct marking points.

    [2]