Anaerobic Respiration in Eukaryotes

Question 1

what occurs/doesn’t when there is no oxygen?

Answer 1

> oxygen cannot be the final electron or proton acceptor
the conc of protons increases in the matrix/decreasing the gradient
no oxidative phosphorylation
reduced NAD and FAD cannot unload H+ so cannot be re oxidised
krebs cycle and link reaction stop

Question 2

Ethanol Fermentation

Answer 2

1) pyruvate is decarboxylated to ethanal by pyruvate decarboxylase
2) ethanal accepts hydrogens from reduced NAD and becomes ethanol
3) reduced NAD is re oxidised and made available to accept H+

Question 3

Lactate fermentation

Answer 3

1) pyruvate accepts hydrogen atoms from the reduced NAD
> pyruvate is reduced to lactate
> reduced NAD becomes oxidised

2)The re oxidised NAD can accept more hydrogen atoms from the triose phosphate

Question 4

How much is ATP produced fork Ethanol and Lactate fermentation?

Answer 4

0 ATP is produced