GCSE Biology - What are Enzymes? (2026/27 exams)
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** WHAT'S COVERED **
1. The role and importance of enzymes in biological processes.
2. Definition and function of catalysts and enzymes.
What a catalyst is and its properties.
Enzymes as biological catalysts made of amino acids.
How enzymes speed up specific reactions.
3. How enzymes work at a molecular level.
The concept of the active site.
The interaction between enzymes and substrates.
Enzyme specificity due to active site shape.
4. Models explaining enzyme action.
The Lock and Key model.
The Induced Fit model.
** EXAM BOARD INFO **
AQA - Suitable for everyone
IGCSE Edexcel - Suitable for everyone
Edexcel - Suitable for everyone
OCR 21st Century - Suitable for everyone
OCR Gateway - Suitable for everyone
CIE - Suitable for everyone
** CHAPTERS **
0:00 Intro & Why Enzymes are Needed
1:14 What are Catalysts?
1:45 Enzymes as Biological Catalysts
2:21 How Enzymes Work - Active Site & Substrates
3:18 Two Models of Enzyme Action
** PLAYLISTS **
• GCSE Maths (9-1)
• GCSE Biology (9-1)
• GCSE Chemistry (9-1)
• GCSE Physics (9-1)
• A-Level Biology
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