OCR Biology Enzymes Revision Notes
Master OCR 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 without being consumed in the process. They are crucial for various metabolic processes and function by lowering the activation energy required for reactions.
Key Concepts
- 1Enzymes are proteins that act as catalysts.
- 2They have a specific active site that binds to substrates.
- 3Enzyme activity can be affected by temperature, pH, and substrate concentration.
- 4Enzymes can be denatured by extreme conditions, losing their functionality.
- 5The lock and key model explains how enzymes and substrates interact.
Simple Explanation
Enzymes are special proteins that help speed up chemical reactions in our bodies. They work by grabbing onto specific molecules called substrates and making it easier for reactions to happen. Each enzyme is designed for a particular job, and if the conditions are too hot or too acidic, they can stop working. Think of enzymes as tools that help our body do its work more efficiently.
Memory Trick
“Remember 'EASE' for Enzymes: Enzymes Are Speedy Enhancers.”
Flashcards
What is an enzyme?
Tap to reveal answer
Exam Questions
Describe and explain the factors affecting enzyme activity. [6 marks]
6 marksView mark scheme hint▾
Discuss temperature, pH, substrate concentration, and enzyme concentration.
Explain how enzyme denaturation affects metabolic processes. [4 marks]
4 marksView mark scheme hint▾
Mention loss of active site shape and impact on reaction rates.
What is meant by enzyme specificity? [2 marks]
2 marksView mark scheme hint▾
Define specificity and relate it to active site and substrate compatibility.
Practice Quiz
What is the primary function of enzymes?
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