Anaerobic Respiration

Question 1

Where does it occur?

Answer 1

-cytoplasm only

Question 2

Why do we need oxygen?

Answer 2

-final acceptor of H ions and e-

Question 3

What happens if no oxygen is available?

Answer 3

-no e- transport chain
-no krebs cycle
-no link reaction

Question 4

How does lactate fermentation work?

Answer 4

1. pyruvate produced in glycolysis is reduced to from lactate
2. by reducing NAD - 2H is added to pyruvate
3. NAD is reused in glycolysis to ensure more ATP is being produced
4. end result is lactate

Question 5

What then happens when lactate is formed?

Answer 5

1. removed to liver in blood circulation
2. large build up of it = reduces pH in muscle cells = fatigue
3. when O2 is available - lactate converts back to pyruvate

Question 6

How does alcoholic fermentation work?

Answer 6

1. pyruvate produced by glycolysis forms ethanal by pyruvate decarboxylase
2. this releases CO2
3. NAD is reduced - donate 2H to ethanal
4. NAD is reused
5. presence of 2H and ethanol dehydrogenase forms ethanol