Review questions, Oct 16

1.      Immediately after completion of the Krebs cycle, most of the usable energy from the original glucose molecule is in the form of __________

a.      acetyl CoA

b.      ATP

c.      NADH

d.      oxygen

e.      carbon dioxide

      2.  During cellular respiration, molecular oxygen (O₂) is used _____.

1. at the end of glycolysis to switch from the fermentation pathway
2. at the end of the Krebs cycle to cycle
3. between glycolysis and the Krebs cycle to split a carbon from pyruvic acid
4. between the Krebs cycle and the electron transport chain to move NADH and FADH₂
5. at the end of electron transport chain to accept electrons and form H₂O

 

3. The energy given up by electrons as they move through the electron transport chain is used to _____.
1. break down glucose
2. make NADH and FADH₂
3. pump H⁺ from mitochondrial matrix to intermembrane space
4. oxidize water
5. manufacture glucose

 

4. Fermentation is essentially glycolysis plus an extra step in which pyruvic acid is reduced to form lactic acid or alcohol and carbon dioxide. This last step _____.
1. removes poisonous oxygen from the environment
2. extracts a bit more energy from glucose
3. enables the cell to recycle NAD⁺
4. inactivates toxic pyruvic acid
5. enables the cell to make pyruvic acid into substances it can use

 

5. When protein molecules are used as fuel for cellular respiration, _____ are produced as waste.
1. amino groups
2. fatty acids
3. sugar molecules
4. molecules of lactic acid
5. ethanol and CO₂

 

 

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