Anaerobic Respiration

Question 1

What stages can’t work if there is no oxygen and why?

Answer 1

1. ETC because NADH and water can’t be made

2. Link reaction and Krebs cycle because no NAD is regenerated to pick up more oxygen

Question 2

How does anaerobic respiration occur in animals?

Answer 2

Glucose - Pyruvate forming 2ATP and 2 Hydrogen - 2H combines w NADH which is then regenerated to 2NAD - the 2H combines w Pyruvate and turns into lactate/lactic acid which can be broken down into CO2 and water in the presence of oxygen.

Question 3

How does anaerobic respiration occur in microorganisms like yeast?

Answer 3

Glucose turns to pyruvate and 2 ATP are made and it’s dehydrogenated making 2H - makes 2NADH which regenerated to 2 NAD - pyruvate decarboxylated to make ethanal - ethanal combines w the 2H to make ethanol