The Respiration Rate of Yeast Depends on Its Conditions

Question 1

What can you do experiments to investigate?

Answer 1

How the rate of CO2 production by yeast changes under different conditions

Question 2

1) what do you do first?

Answer 2

Mix together some sugar, yeast and distilled water, then add the mixture to a test tube

Question 3

2) what do you do second?

Answer 3

Attach a bung with a tube leading to a second test tube of water

Question 4

3) what do you do third?

Answer 4

Place the tube containing the yeast mixture In a water bath at a certain temperature

Question 5

4) what do you do fourth?

Answer 5

Leave the tube to warm up then count how many bubbles are produced in a given period of time. Use this to calculate rate of CO2 production

Question 6

5) what do you do fifth?

Answer 6

Repeat the experiment with the water baths set at different temps

Question 7

6) what happens sixth?

Answer 7

Respiration is controlled by enzymes - so as temp increases, so should the rate of respiration

Question 8

How could you alter the experiment to give more accurate results?

Answer 8

By replacing the second tube with a gas syringe - you’d measure the volume of gas produced instead