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AQA Curriculum 2024/25
GCSE Biology Revision: Complete Topic Guide
Explore clear GCSE Biology explanations, key definitions, required practicals, diagrams and exam questions across the full course.
Exam Board Note: This content is specifically structured to follow the AQA GCSE Biology (8461) and Combined Science: Trilogy (8464) specifications.
Core Course Topics
Cell biology
Master cell structure, transport processes, and cell division. Includes microscopy required practicals.
Organisation
Digestive system, enzymes, and heart structure.
Infection
Communicable diseases and immune response.
Bioenergetics
Photosynthesis and respiration processes.
Homeostasis
The nervous system, hormonal coordination, and the human brain.
Inheritance
Genetics, evolution, and variation.
Ecology
Adaptations, carbon cycle, and biodiversity impact.
Working Scientifically
Experimental methods, data handling, and evaluation skills.
Required Practicals & Diagrams
MUST KNOW
Practical 4: Food Tests
Testing for carbohydrates, lipids, and proteins.
- Benedict's:Tests for Sugars (Blue to Brick Red)
- Iodine: Tests for Starch (Brown to Blue-Black)
- Biuret: Tests for Proteins (Blue to Purple)
- Sudan III: Tests for Lipids (Red layer)
Graph & Math Skills
DATA SKILLS
Calculating percentage change in mass during osmosis.
MAGNIFICATION
Applying the I=AM formula for microscopy questions.
PROBABILITY
Using Punnett squares to predict inheritance ratios.
Key Definitions
Osmosis
The net movement of water from a dilute to a concentrated solution through a partially permeable membrane.
Homeostasis
Maintenance of a constant internal environment despite external changes.
Enzyme
A biological catalyst that speeds up chemical reactions without being used up.
Related Subjects
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Revision Videos & Guides
The Heart & Blood Vessels
12:45 • Detailed walkthrough
Photosynthesis Masterclass
08:20 • Practical focus
Culturing Microorganisms
15:10 • Step-by-step guide
Frequently Asked Questions
Which exam boards do these resources cover?
Our primary resources are built for the AQA specification, which is the most popular in the UK. However, about 90% of the content overlaps with Edexcel, OCR, and WJEC boards.
Do I need to know the 'Required Practicals' for the exam?
Yes! At least 15% of your marks come from questions about the required practicals. You need to know the methods, independent/dependent variables, and how to evaluate results.
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