Chapter 7.8: Oxidation Without O2 Flashcards
1
Q
How does lactic acid fermentation work?
A
- This reaction converts pyruvate into lactic acid and regenerates NAD+ from NADH
2
Q
What does sulfur bacteria use as the electron acceptor?
A
- In sulfate respiration, the prokaryotes derive energy from the reduction of SO4 to hydrogen sulfide (H2S)
3
Q
What is the first step of ethanol fermentation?
A
- Yeast enzymes remove a terminal CO2 group from pyruvate through decarboxylation, producing a 2-carbon molecule called acetaldehyde
4
Q
After Yeast enzymes remove a terminal CO2 group from pyruvate through decarboxylation, producing a 2-carbon molecule called acetaldehyde what is the last step of ethanol fermentation?
A
- The acetaldehyde accepts a pair of electrons from NADH producing NAD+ and ethanol (ethyl alcohol)
5
Q
What is fermentation?
A
- In the absence of oxygen, cells that cannot utilize an alternative electron acceptor for respiration must rely exclusively on glycolysis to produce ATP
- Under these conditions, the electrons generated by glycolysis are donated to organic molecules in a process called fermentation
- Recycles NAD+
- Under these conditions, the electrons generated by glycolysis are donated to organic molecules in a process called fermentation
6
Q
What do methanogens use as an the elctorn acceptor?
A
Methanogens CO2 as the electron acceptor, reducing CO2 to CH4
7
Q
What is the formula for bacteria fermentation?
A
Organic Molecule + NADH –> Reduced Organic Molecule + NAD+
8
Q
Where does ethanol fermentation occur?
A
in yeast