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 typically proteins that work by lowering the activation energy required for reactions to occur.
Key Concepts
- 1Enzymes are specific to their substrates.
- 2The active site is where the substrate binds.
- 3Enzymes can be affected by temperature and pH.
- 4Enzyme activity can be inhibited or activated.
- 5Enzymes are crucial for metabolic pathways.
Simple Explanation
Enzymes are like helpers in our bodies that make chemical reactions happen faster. They work by grabbing onto a specific molecule called a substrate and changing it into something else. Each enzyme is designed for a particular job, and factors like heat or acidity can affect how well they work. Without enzymes, many processes in our bodies would take too long to happen.
Memory Trick
“Remember 'EASE' for Enzymes: Enzymes Are Specific and Efficient.”
Flashcards
What is the function of enzymes?
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Exam Questions
Describe and explain the effect of temperature on enzyme activity. [6 marks]
6 marksView mark scheme hint▾
Discuss the range of temperatures, optimum temperature, denaturation, and enzyme activity changes.
Explain how pH affects enzyme activity. [4 marks]
4 marksView mark scheme hint▾
Mention the concept of optimum pH and denaturation.
What is meant by enzyme specificity? [2 marks]
2 marksView mark scheme hint▾
Define specificity in terms of substrate and active site.
Practice Quiz
What is the role of an enzyme in a chemical reaction?
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