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Exam-style practice

Biological molecules answer explanations

Review worked answers and explanations for Biological molecules. Aligned to Cambridge IGCSE Combined Science.

Answer explanations

Question 1 of 6

Review the answer support, then move sideways through the set.

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.

    [2]