Unit 3 5D: Factors affecting the rate of photosynthesis

Question 1

List three factors which affect the rate of cellular respiration

Answer 1

1. Temperature
   2.Glucose Availability
2. Oxygen Concentration

Question 2

How does temperature affect cellular respiration

Answer 2

The rate of cellular respiration increases as temperature increases, but only up to the optimum, Beyond this point, the enzymes become denatured, their active site changes shape and they are unable to bind to the substrate. Consequently, The process of Cellular Respiration slows down.

Question 3

Where does glucose come from in multicellular organisms

Answer 3

They import extracellular glucose or use a stored form of glucose, called glycogen. If glucose stores become low, the body draws on alternative sources. Pyruvate, lactic acids and lipids may be recycled to make the glucose required for cellular respiration

Question 4

How does Oxygen concentration affect cellular respiration

Answer 4

If oxygen availability is low, the progress of this stage will be limited and its rate will decrease.
When oxygen is low, the cell will switch to anaerobic respiration, which will result in less ATP per glucose molecule (2 ATP), than if aerobic respiration was occurring (30-32 ATP)

Question 5

What stage of Cellular respiration produces CO2?

Answer 5

The Krebs Cycle