7 - ANAEROBIC RESPIRATION

Question 1

What is the difference between anaerobic and aerobic respiration?

Answer 1

Anaerobic respiration doesn’t use oxygen, and therefore doesn’t involve the link reaction, Krebs cycle, and oxidative phosphorylation.

Question 2

What is the one type of anaerobic respiration that we need to know about and where does it occur?

Answer 2

Lactate fermentation and It occurs in animals

Question 3

How does it work?

Answer 3

1) Glucose if converted to pyruvate via glycolysis
2) Reduced NAD (from glycolysis) transfers hydrogen to pyruvate to from lactate and NAD (reused in glycolysis)

Question 4

What does the production of lactate regenerate and what does this mean?

Answer 4

NAD, meaning that glycolysis can continue (even if there isn’t much oxygen), so a small amount of ATP can be produced

Question 5

How is the lactic acid broken down (what are the two ways)?

Answer 5

1) Cells convert the lactic acid back to pyruvate (which then re-enters aerobic respiration at the Krebs cycle)
2) Liver cells can convert the lactic acid back to glucose (which can be respired or stored)