Enzymes (AQA GCSE Biology): Quizzes
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Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
What are enzymes?
What are enzymes?
Protein molecules that speed up reactions
What is the active site of an enzyme?
What is the active site of an enzyme?
The part where the reaction happens
In the lock and key theory, what does the substrate represent?
In the lock and key theory, what does the substrate represent?
The key
What does enzyme specificity mean?
What does enzyme specificity mean?
Only right substrate fits each enzyme
What happens to products after an enzyme catalyses a reaction?
What happens to products after an enzyme catalyses a reaction?
Products released, enzyme can be reused
What does it mean when an enzyme becomes denatured?
What does it mean when an enzyme becomes denatured?
Shape changes, stops working permanently
Why do enzymes work slowly at low temperatures?
Why do enzymes work slowly at low temperatures?
Molecules move slowly
What is the optimum temperature for an enzyme?
What is the optimum temperature for an enzyme?
Best temp where enzyme works fastest
What happens to an enzyme at too high a temperature?
What happens to an enzyme at too high a temperature?
Gets denatured and stops working
Why does each enzyme have an optimum pH?
Why does each enzyme have an optimum pH?
Enzyme has perfect shape at optimum pH
What is the optimum pH for pepsin (stomach enzyme)?
What is the optimum pH for pepsin (stomach enzyme)?
pH 1.5-2.0
How does bile help lipase break down fats?
How does bile help lipase break down fats?
Breaks fat into droplets, more surface