CELL RESPIRATION
GLYCOLYSIS
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Ethanol fermentation, by oxidising NADH and producing CO2 and ethanol.
|
|
|
Lactic acid Fermentation, by oxidising NADH and producing lacate.
|
|
|
Ethanol fermentation, by reducing NADH and producing ethanol
|
|
|
Lactic acid Fermentation, by reducing NADH and producing lactate
|
Detailed explanation-1: -Under anaerobic conditions, pyruvate has a different fate. Instead of entering mitochondria, the cytosolic enzyme lactate dehydrogenase converts pyruvate to lactate.
Detailed explanation-2: -Ethanol fermentation is a two step process. Pyruvate (pyruvic acid) is first converted into carbon dioxide and acetaldehyde. The second step, converts acetaldehyde to ethanol and oxidizes NADH to NAD+.
Detailed explanation-3: -Pyruvate is reduced into ethanol or lactate. But why is it important to reduce pyruvate, especially when it could be further oxidized to produce more ATP, as happens in aerobic respiration? substrate, glycolysis, the Krebs cycle, and ATP production will all come to a stop.
Detailed explanation-4: -During aerobic conditions, NADH is reoxidized to NAD+ in the mitochondria and during anaerobic conditions, it is regenerated by lactate dehydrogenase.