Section 5 - Yellow

Question 1

Define the term enzyme

Answer 1

A biological catalyst with roles in metabolic reactions

Question 2

Describe the effect of increasing temperature on enzyme activity

Answer 2

Increase in temperature; more kinetic energy; more likely to be a collision between enzyme active site and substrate; increased rate of reaction. If temperature becomes too high, enzyme denatures and shape of active site changes.

Question 3

What is an enzyme-substrate complex

Answer 3

Enzyme’s active site bond to a substrate.

Question 4

How does pH affect enzyme activity

Answer 4

If pH moves too low or too high, the enzyme active site will change shape, meaning the substrate will no longer be able to specifically bind into an active site

Question 5

What is meant by the term ‘optimum’?

Answer 5

The conditions which mean the rate of enzyme activity is highest.

Question 6

What happens to an enzyme after a reaction at its optimum temperature and pH?

Answer 6

It remains unchanged

Question 7

What is the optimum temperature for digestive enzymes?

Answer 7

37°C

Question 8

Which of the following processes in the human body does not directly involve enzymes?

Answer 8

Movement of respiratory gases into the blood