1.7 Enzyme action

Question 1

What are enzymes?

Answer 1

Biological catalysts

Question 2

What are their functions?

Answer 2

To speed up the rate of an reaction

Question 3

How do enzymes speed up rate of reaction?

Answer 3

By lowering the activation energy

Question 4

Can enzymes be used for more than once?

Answer 4

Yes

Question 5

What are enzymes made of?

Answer 5

Proteins

Question 6

What is the specific region that is functional in enzymes?

Answer 6

Active site

Question 7

What does the induced-fit model of enzyme action suggest?

Answer 7

1. the substrate and active site are not completely complementary, but there is still some complementarity
2. the active site forms as the substrate and enzyme interact
3. the proximity of the substrate leads to the change in the enzyme that forms the functional active site
4. the enzyme is flexible and can change shape slightly as it binds to the substrate
5. after completing the reaction, the enzyme changes back to its original shape, and the the active site is free to accept another substrate