The Roles of Enzymes (OCR A-Level Biology A): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
Which property explains why enzymes work in small quantities?
Which property explains why enzymes work in small quantities?
They are reused repeatedly after reactions
What are the products when catalase breaks down hydrogen peroxide?
What are the products when catalase breaks down hydrogen peroxide?
Water and oxygen
Which enzyme is an example of an extracellular enzyme?
Which enzyme is an example of an extracellular enzyme?
Amylase secreted into the mouth
How does the active site shape relate to the substrate?
How does the active site shape relate to the substrate?
Complementary to the substrate
What happens to the active site in the induced-fit hypothesis?
What happens to the active site in the induced-fit hypothesis?
It changes shape as substrate binds
How do enzymes speed up reactions?
How do enzymes speed up reactions?
Lower activation energy via alternative pathway
If rate at 20°C is 8 units and at 10°C is 4 units, what is Q₁₀?
If rate at 20°C is 8 units and at 10°C is 4 units, what is Q₁₀?
2
What is the optimum pH for pepsin (gastric protease)?
What is the optimum pH for pepsin (gastric protease)?
pH 2
Why does rate plateau at high substrate concentration?
Why does rate plateau at high substrate concentration?
All enzyme active sites are occupied
What is the relationship between enzyme concentration and rate?
What is the relationship between enzyme concentration and rate?
Linear when substrate is in excess