Topic 5

Question 1

What is a catalyst

Answer 1

Speeds up chemical reaction and remains chemically unchanged at the end of the reaction

Question 2

How enzymes work

Answer 2

Breaking large molecules into small ones
Building up large molecules from small ones
Converting one small molecule into another

Question 3

Five properties of enzymes

Answer 3

They are all proteins
Each enzyme catalyzes one particular metabolic reaction
They can be used again and again
They are influenced by temperature
They are influenced by pH

Question 4

What are the two parts of the enzyme called

Answer 4

Substrate and active site and they are complementary

Question 5

Effect of temperature on enzymes

Answer 5

Slow at low temp
Increases as temp increases
40c is max
Decreases after

Question 6

How does increasing temp increase enzyme activity

Answer 6

Greater kinetic energy and they move around more quickly and more chances of them colliding

Question 7

What happens when enzyme goes past max temp

Answer 7

It denatures meaning it can’t catalyze the reaction

Question 8

Effect of ph on action of a protease experiment

Answer 8

Set up a bath at 40c and label 3 test tubes
Using a syringe put 5cm3 of egg white into each test tube
Add 2cm3 for 1.sodium carbonate 2. water and 3. dilute hydrochloric acid
Then add 1cm3 of protease and compare every minute and wait until no further change