Enzymes (HSC SSCE Biology): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
ShowHide
Practise the questions
10 questions from this quiz
What happens to an enzyme after it catalyses a chemical reaction?
What happens to an enzyme after it catalyses a chemical reaction?
It remains unchanged & can be reused
How do enzymes speed up chemical reactions in cells?
How do enzymes speed up chemical reactions in cells?
By lowering the activation energy
What is the active site of an enzyme?
What is the active site of an enzyme?
Region where substrates bind to enzyme
Why can each enzyme only catalyse one specific type of reaction?
Why can each enzyme only catalyse one specific type of reaction?
Active site shape matches one substrate
What is the key difference between lock-and-key and induced-fit models?
What is the key difference between lock-and-key and induced-fit models?
Induced-fit shows enzyme changes shape
Which model of enzyme action is currently accepted by scientists?
Which model of enzyme action is currently accepted by scientists?
Induced-fit model
What is the optimum temperature for most enzymes in humans?
What is the optimum temperature for most enzymes in humans?
Approximately
What happens to enzymes at temperatures between ?
What happens to enzymes at temperatures between ?
They denature irreversibly
Which enzyme works best in highly acidic conditions with optimum pH around ?
Which enzyme works best in highly acidic conditions with optimum pH around ?
Pepsin
What occurs at the saturation point in enzyme-catalysed reactions?
What occurs at the saturation point in enzyme-catalysed reactions?
All enzyme molecules are occupied