Chapter 7.8: Oxidation Without O2 Flashcards

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1
Q

How does lactic acid fermentation work?

A
  • This reaction converts pyruvate into lactic acid and regenerates NAD+ from NADH
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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)
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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
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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)
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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+
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6
Q

What do methanogens use as an the elctorn acceptor?

A

Methanogens CO2 as the electron acceptor, reducing CO2 to CH4

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7
Q

What is the formula for bacteria fermentation?

A

Organic Molecule + NADH –> Reduced Organic Molecule + NAD+

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8
Q

Where does ethanol fermentation occur?

A

in yeast

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