Anaerobic respiration

Question 1

consequences of not enough oxygen present

Answer 1

There is no final acceptor of electrons from the electron transport chain
The electron transport chain stops functioning
No more ATP is produced via oxidative phosphorylation
Reduced NAD and FAD aren’t oxidised by an electron carrier
No oxidised NAD and FAD are available for dehydrogenation in the Krebs cycle
The Krebs cycle stops

Question 2

lactate fermentation steps

Answer 2

pyruvate from glycolysis+ lactate dehydrogenase enzyme (NADH- NAD, +H)- lactate

Question 3

ethanol fermentation steps

Answer 3

pyruvate from glycolysis + pyruvate decarboxylase (release CO2)- ethanal + ethanol dehydrogenase (NADH -NAD, +1 H+) - ethanol
-ethanol cannot be further metabolised= waste product

Question 4

pathway of lactate after fermentation

Answer 4

1. it can be oxidised back to pyruvate which is channelled into krebs for ATP production (the oxidisation need extra O2, = O2 debt)
   2.can be converted into glycogen for storage in the liver