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Biology · Learn
43 lessons in 11 units, about 75 h of reading and core practice. Each lesson ends with a quick check.
Specification
Unit 1
This unit covers the chemical principles of living systems, from water and biological macromolecules to enzymes, nucleic acids and energy carriers.
3 lessons · 5 h 15 min of study · ≈9% of the test
Unit 2
This unit develops cell theory from ultrastructure and transport to microscopy, division, differentiation and viral organisation.
4 lessons · 7 h of study · ≈10% of the test
Unit 3
This unit explains how organisms exchange materials with their environment and move substances within animals and plants.
4 lessons · 7 h 45 min of study · ≈11% of the test
Unit 4
This unit studies human health in biological context, including pathogens, immune responses, public health, diagnosis and applied uses of biological evidence.
4 lessons · 6 h 45 min of study · ≈9% of the test
Unit 5
This unit follows energy through cells and ecosystems via photosynthesis, respiration, productivity and nutrient cycling.
3 lessons · 6 h of study · ≈9% of the test
Unit 6
This unit covers nervous and hormonal control, internal regulation, movement, excretion and the maintenance of stable conditions.
5 lessons · 8 h 45 min of study · ≈11% of the test
Unit 7
This unit explains genetic continuity and change, from DNA replication and inheritance to population genetics and evolution.
4 lessons · 8 h of study · ≈12% of the test
Unit 8
This unit studies how genes are regulated and manipulated, linking molecular biology to modern biotechnology and its social implications.
3 lessons · 5 h 30 min of study · ≈8% of the test
Unit 9
This unit connects classification and biodiversity with evolutionary processes, ecosystems, conservation and field ecology.
4 lessons · 7 h 45 min of study · ≈12% of the test
Unit 10
This unit covers reproductive biology, developmental processes, growth control in plants and the microbial contexts used in several specifications.
4 lessons · 5 h 30 min of study · ≈5% of the test
Unit 11
This unit consolidates experimental technique, quantitative analysis, planning and the exam-specific communication skills used across A Level Biology.
5 lessons · 6 h 45 min of study · ≈6% of the test
Start here
Molecular basis of life · Lesson 1 of 3
This topic covers the structure, bonding, properties and biological functions of carbohydrates, lipids, proteins, water and key inorganic ions. Exams typically test identification of molecules from structural features, explanation of how bonding determines function, and interpretation of food-test, biochemical or data-based questions.
2 h of study≈3% of the test
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Every lesson is free to read. With an account, finished lessons are ticked off, quick checks feed your mastery, and flashcards come back for review.
Strategy, scoring and test day, beyond the syllabus.
Learn, then practise
Each lesson ends with three quick questions. For more, practice adapts to the topics you’re weakest on.
Open practice