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Biological molecules
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Elements and building blocks

Elements and building blocks

Comparison of carbohydrate, protein and lipid molecules showing their elements and the smaller units that build them Living organisms contain biological molecules such as carbohydrates, proteins and lipids. A chemical element is a pure substance made from one type of atom, such as carbon or oxygen.

Biological molecules Lesson

  1. IGCSE
  2. /Biology
  3. /Biological molecules

Step-by-step lessons covering Edexcel IGCSE Biology Biological molecules for IGCSE Biology. Each lesson works through exam-style questions in Paper 1 and Paper 2 format. Start with the foundational cell biology and core content before moving on to the more data-heavy ecology, genetics and practical-skills topics, which carry a large share of the exam marks.