Anaerobic Respiration

Question 1

Why Anaerobic respiration only involve Glycolysis

Answer 1

No O2 as final electron acceptor = cytochrome has E- left over + H+ in matrix

Full ETC = NADH+FADH2 cannot drop off hydrogen and regenerate/oxidise

Reduced Co-enzyme = occupy, can’t take part in Link reaction, Krebs cycle or ETC

Question 2

Glycolysis in anaerobic respiration in mammal + some bacteria (lactic acid fermentation)

Answer 2

1)Glucose->2 pyruvate
-2 NAD reduce using dehydrogenase
-2 ADP to ATP with some energy (after dehydrogenation)

2)2 pyruvate -> 2 Lactate (become lactic acid)
-2 NADH become oxidise (NAD) and go back to working on glycolysis
(NAD regeneration)

-Lactate reversible O2 available (Oxygen debt)

Known as lactic acid fermentation

Question 3

Glycolysis in anaerobic respiration in plant + yeast

Answer 3

1) Glucose -> 2 Pyruvate
-2 NAD reduced
-2 ATP net yield

2)Pyruvate -> Ethanal
-Decarboxylation = CO2 released

3) Ethanal -> Ethanol
-2 NADH drop of H to ethanal, become NAD and re-used

Ethanol not reversible, toxic = kill cells
Alcoholic fermentation

Question 4

Comparisons of aerobic + anaerobic respiration
(Similarities + difference)

Answer 4

Similarity
-Glycolysis occurs in both

Difference
-Aerobic 38 ATP/glucose, anaerobic 2 ATP
-Aerobic O2 as final electron acceptor, anaerobic Pyruvate
-Aerobic end product = H2O, anaerobic ethanol + lactate both toxic
-Aerobic, go through respiration cycle, anaerobic only glycolysis
-Aerobic use NAD+FAD, anaerobic only FAD