Respiration and ATP production
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What is the net glycolytic ATP yield per glucose?
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Two
Four produced minus two invested gives two net.
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How many Krebs turns are associated with one glucose?
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Two
Each of the two acetyl CoA enters a turn.
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One glucose molecule is fully respired aerobically. How many molecules of CO2 are released in the Krebs cycle itself?
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4
Each turn releases 2 CO2 and one glucose gives two acetyl CoA, so 2 turns x 2 = 4. The other 2 come from the link reaction.
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Where is proton concentration elevated by the respiratory chain?
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The intermembrane space relative to the matrix
The chain pumps protons out of the matrix across the inner membrane.
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Which pair is correct?
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Yeast ethanol formation releases CO2; lactate formation does not.
Yeast decarboxylates pyruvate to ethanal before reducing it.
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Which statement about fermentation in yeast is NOT correct?
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It produces extra ATP from pyruvate
The steps after pyruvate make no ATP. Only the two net ATP from glycolysis are made.
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Why include a matched non-respiring control?
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To estimate non-biological effects on gas movement
This helps correct for temperature or pressure changes.
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