Topic 2.5: Enzymes

Question 1

Define enzyme

Answer 1

An enzyme is a globular protein which acts as a biological catalyst by speeding up the rate of a chemical reaction

Question 2

Define active site

Answer 2

The active site is the region on the surface of the enzyme which binds to the substrate molecule

Question 3

What is the first step of enzyme catalysis?

Answer 3

When a substrate binds to the enzyme’s active site, an enzyme-substrate complex is formed

Question 4

After When a substrate binds to the enzyme’s active site, an enzyme-substrate complex is formed what is the next step of enzyme catalysis?

Answer 4

The enzyme catalyses the conversion of the substrate into product, creating an enzyme-product complex

Question 5

After The enzyme catalyses the conversion of the substrate into product, creating an enzyme-product complex what is the last step of enzyme catalysis?

Answer 5

The enzyme and product then dissociate – as the enzyme was not consumed, it can continue to catalyse further reactions