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Questions and Answers
During pyruvate oxidation, which molecule accepts the removed hydrogen?
During pyruvate oxidation, which molecule accepts the removed hydrogen?
- FADH2
- ATP
- NADH (correct)
- CoA-SH
What type of molecule is released during the decarboxylation step of pyruvate oxidation?
What type of molecule is released during the decarboxylation step of pyruvate oxidation?
- Water
- ATP
- Carbon Dioxide (correct)
- Ethanol
Which molecule does acetyl-CoA combine with to initiate the Krebs cycle?
Which molecule does acetyl-CoA combine with to initiate the Krebs cycle?
- Pyruvate
- Oxaloacetate (correct)
- Citrate
- Isocitrate
Besides carbon dioxide, what other energy-rich molecule is released during Krebs cycle steps?
Besides carbon dioxide, what other energy-rich molecule is released during Krebs cycle steps?
After citrate undergoes several reactions in the Krebs cycle, what is it eventually converted back into so the cycle can continue?
After citrate undergoes several reactions in the Krebs cycle, what is it eventually converted back into so the cycle can continue?
How many molecules of ATP are directly produced from each molecule of glucose that undergoes cellular respiration, considering that each glucose molecule produces two molecules of pyruvate?
How many molecules of ATP are directly produced from each molecule of glucose that undergoes cellular respiration, considering that each glucose molecule produces two molecules of pyruvate?
Which of the following molecules produced during the Krebs cycle subsequently donate electrons to the electron transport chain?
Which of the following molecules produced during the Krebs cycle subsequently donate electrons to the electron transport chain?
In the Krebs cycle, at which point is GTP (guanosine triphosphate) generated, which can then be converted to ATP?
In the Krebs cycle, at which point is GTP (guanosine triphosphate) generated, which can then be converted to ATP?
If a cell is under anaerobic conditions after glycolysis, what process must occur before the remaining steps such as the Krebs cycle and electron transport chain can proceed if oxygen becomes available again?
If a cell is under anaerobic conditions after glycolysis, what process must occur before the remaining steps such as the Krebs cycle and electron transport chain can proceed if oxygen becomes available again?
Why is it important that oxaloacetate is regenerated at the end of the Krebs cycle?
Why is it important that oxaloacetate is regenerated at the end of the Krebs cycle?
Flashcards
Pyruvate entry point
Pyruvate entry point
Pyruvate enters the mitochondrion from the cytoplasm before oxidation.
Decarboxylation
Decarboxylation
The process where one carbon atom is removed from a molecule, releasing carbon dioxide (CO2).
Krebs Cycle Entry
Krebs Cycle Entry
Acetyl-CoA enters the Krebs cycle, combines with oxaloacetate to form citrate.
Krebs Cycle Process
Krebs Cycle Process
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Products for next Stage
Products for next Stage
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Waste product of krebs cycle
Waste product of krebs cycle
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Energy form of Krebs cycle
Energy form of Krebs cycle
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Glucose Yield
Glucose Yield
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Study Notes
- Pyruvate enters the mitochondrion from the cytoplasm.
- A carbon atom is removed from Pyruvate via decarboxylation.
- Hydrogen is removed from Pyruvate using NAD+ Coenzyme A.
- Carbon atoms become attached to a remaining molecule creating acetyl-CoA.
- Acetyl-CoA then enters the Krebs cycle.
- Acetyl-CoA enters the cycle combine with oxaloacetate to make the six-carbon compound citrate.
- Citrate undergoes a number of reactions during the eight steps of the Krebs cycle.
- CO2 and ATP are released in a number of steps converting Citrate into oxaloacetate again.
- Oxaloacetate can be used again during the Krebs cycle.
- CO2 is released as waste.
- NADH and FADH2 move to the next stage of cellular respiration.
- Energy is released in the form of ATP.
- A glucose molecule produces two molecules of ATP.
- Two molecules of pyruvate are created from each molecule of glucose.
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