Last Minute Revise Bites

Question 1

An enzyme is used with a substrate. It is then cooled and the experiment is repeated. What will the enzyme activity show?

Answer 1

Refer to the graph - the curve will remain flat.

Why? The enzyme is denatured so the substrate cannot fit.

Question 2

In one tube, aluminium foil completely covers the plant. Will CO2 increase, fall, or stay the same? Why?

Answer 2

CO2 will rise as there is no sunlight so the photosynthesis rate will be low.
The respiration rate will be higher as the starch is used for anaerobic respiration.

Question 3

One tube with a plant in it is not covered. It is exposed to a light. Will CO2 increase?

Answer 3

The tube has sunlight so it will be able to photosynthesise, reducing the levels of carbon dioxide as glucose is produced. The CO2 is limited.

Question 4

One plant in the tube is covered lightly. It is under a light. Will CO2 rise or fall?

Answer 4

A lower rate of photosynthesis will equal the rate of respiration, so the CO2 will remain constant 👇🏻