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Identify the chemical elements that constitute carbohydrates, fats, and proteins.

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  • Practise with linked questions.
Cambridge IGCSE Combined ScienceBiological moleculesCore content

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Identify the chemical elements that constitute carbohydrates, fats, and proteins

  • This point belongs to Biological molecules, especially Biological molecules outcomes.
  • You need to be able to identify the chemical elements that constitute carbohydrates, fats, and proteins.
  • The key ideas to know are Identify and State.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

IdentifyState

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Paper 3 structured question: Biological molecules

Paper 3Theory (Core)2 marks

Description

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]
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