Fermentation

Question 1

Fermentation

Answer 1

A CR pathway that uses glycolysis and a process that transfers electrons from NADH to an organic acceptor (to recycle NAD+) in anaerobic conditions

Question 2

Ethanol Fermentation

Answer 2

Occurs in yeast and bacteria –> pyruvate has carbon dioxide removed to create 2-carbon acetaldehyde then is reduced by NADH to produce ethanol and NAD+

Question 3

Lactate Fermentation - What?

Answer 3

Occurs in some single-celled organisms (some bacteria) and some animal cells when oxygen used faster than taken in or NADH made faster than reduced

Question 4

Lactate Fermentation Process

Answer 4

Pyruvate reduced by NADH to create lactate (lactic acid) and NAD+, due to ETC temporarily shut down from lack of O2; since pyruvate used, no pyruvate oxidation or Kreb’s occurs

Question 5

Lactate - Where it goes?

Answer 5

In bacteria, secreted to environment, which makes it acidic
In animal cells, need to be reoxidized and metabolized to pyruvate to protect tissue from acidity –> transported to liver via bloodstream which metabolizes it to pyruvate, then converts some to glycogen which stored in muscle tissue
(needs oxygen - called “oxygen debt”)