What happens after glycloysis has split glucose anaerobically into two pyruvate molecules.
The pyruvate molecules continue on into the mitochondrial matrix to Krebs and the Electron transport chain.
What gas needs to be present for pyruvate molecules to continue into the mitochondrial matrix to krebs and the electron transport chain?
Oxygen (O2) needs to be present for pyruvate molecules to continue into the mitochondrial matrix to krebs and the electron transport chain.
What happens if there is no oxygen present for the pyruvate molecules to continue?
If oxygen (O2) is not present, fermentation happens instead.
What does fermentation not make?
Fermentation does not make ATP.
What must be present for fermentation to occur?
Puyruvate and NADH must be present to occur.
What is the ATP produced by?
ATP is produced by glycolysis (only 2 ATP).
What happens in the absence of oxygen?
In the absence of oxygen, pyruvate and NADH are fermented to form lactate (lactic acid)
What does lactic acid do?
Lactic acid causes muscles to “burn” during exercise.
How is NADH used up?
NADH is used up by losing its electrons to become NAD+, which is recycled back into glycolysis.
What is there other than lactic acid fermentation?
There is also Alcoholic Fermentation (yeast).
What are the products for lactic acid fermentation?
Lactic acid and NAD+.
What are the products for alcoholic fermentation?
Ethanol, CO2, and NAD+.
How are lactic acid fermentation and alcoholic fermentation similar?
Both are anaerobic, both involve glycolysis (glucose breakdown to ATP), both recycle NAD+. Their products are different LAF (lactic acid) AF (ethanol and (CO2).
Summarize alcoholic fermentation in yeast.
Sugars are broken down into pyruvate and NADH (glycolysis), which enter fermentation and produce alcohol and CO2, the NAD+ is recycled back into glycolysis.
Explain the importance of alcoholic fermentation in bread’s fluffy texture.
CO2 produced from alcoholic fermentation creates the gas pockets in bread.
What is the relationship between glycolysis and fermentation?
Glycolysis leads to fermentation if no oxygen is available.