A-Level Biology Enzymes Revision Notes
Master A-Level Biology Enzymes using simple revision notes, key facts and practice questions — all generated by AI for your exam.
Enzymes are biological catalysts that speed up chemical reactions in living organisms by lowering the activation energy required. They are essential for processes such as digestion and metabolism.
Key Concepts
- 1Enzymes are proteins that act as catalysts in biochemical reactions.
- 2Each enzyme has a specific active site that binds to its substrate.
- 3Enzymes are affected by factors such as temperature, pH, and substrate concentration.
- 4Enzyme activity can be inhibited by competitive and non-competitive inhibitors.
- 5Enzymes can be reused and are not consumed in the reactions they catalyze.
Simple Explanation
Enzymes are special proteins that help speed up chemical reactions in our bodies. They work by binding to molecules called substrates, making it easier for reactions to happen. Factors like heat and acidity can change how well enzymes work. Even though they help with reactions, enzymes themselves don’t get used up and can keep working over and over.
Memory Trick
“Remember 'EASE' for enzymes: Enzymes Are Specific and Efficient.”
Flashcards
What is the role of enzymes in biological reactions?
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Exam Questions
Describe and explain the induced fit model of enzyme action. [6 marks]
6 marksView mark scheme hint▾
Discuss the specificity of active sites, how substrates induce changes in enzyme shape, and the significance of this model.
Explain how temperature affects enzyme activity. [4 marks]
4 marksView mark scheme hint▾
Include the concept of optimal temperature, denaturation, and changes in kinetic energy.
What is meant by enzyme specificity? [2 marks]
2 marksView mark scheme hint▾
Define specificity and relate it to the structure of the enzyme and substrate compatibility.
Practice Quiz
What is the primary function of enzymes?
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