Download 2. ______ What is the role of NAD+ in cellular respiration?

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Date ______ Block ______ NB#:_____
Cellular respiration: Practice Problems
Understand:
1. _________Which of the following is NOT a product of glycolysis?
A. ATP
B. Pyruvate
C. CO2
D. NADH
2. __________ What is the role of NAD+ in cellular respiration?
A. It functionds as an electron carrier B. It is the final electron acceptor
B. It functions as an enzyme
D. It is a nucleotide source for the synthesis of ATP
3. __________ The Kreb cycle occurs in the
A. mitochondria
B. cytoplasm
C. lysosome
D. nucleus
4. __________The electrons carried by NADH and FAHD2 can be
A. Moved between proteins in the inner membrane of the mitochondria
B. transferred to the ATP synthase
C. Moved between proteins in the inner membrane of the mitochondria
D. used as the final electron acceptor
5. __________Which process is anaerobic?
A. Electron transport chain
B. Krebs cycle
C. Glycolysis
D. Citric acid cycle
6. __________Which of the following is the chemical formula for cellular respiration?
A. C6H12O6+6O2→6CO2+6H2O+energy
B. C6H12O6 → 2 CH3CH2OH(ethyl alcohol) + 2 CO2
C. C3H3O3 (pyruvate) + NADH → C3H6O3 (lactic acid) + NAD+
D. H2O + CO2 → C6H12O6+6O2
7. __________Can ATP be produced in the absence of oxygen?
A. No, O2 is necessary as the final electron acceptor
B. Yes, oxygen can be generated by splitting water
C. No, anaerobic organisms only need glycolysis and fermentation
D. Yes, but it requires at alternative to O2 as the final electron acceptor
8. __________Why is fermentation important in cells?
A. It produces ATP when there is no oxygen.
B. It produces ATP.
D. It generates O2
C. It produces pyruvate.
9. Write out the products & reactants of cellular respiration.
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9. What are the 3 steps of cellular respiration? Write out the products of each step.
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10. Draw and label an ATP molecule. Put a star on the high-energy bond.
11. What is this process called? What is it used for?
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12. Draw a basic flow chart of energy flow through an ecosystem. (Hint: How do you go from sunlight
to ATP?)
15. What is the significance of oxygen in cellular respiration? (Hint: think about what oxygen does in
the electron transport chain & what happens when there is no oxygen available)
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16. Define catabolic and anabolic reactions.
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17. What are the 2 laws of thermodynamics?
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18. Define kinetic and potential energy.
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19. What is chemical energy?
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20. How much energy is lost when energy is transferred from one organism to the next?
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21. What is energy lost as?
22. Fill in reactants and products of the steps of cellular respiration.
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Apply (Practice open ended test questions! ):
23. Compare and contrast anaerobic and aerobic respiration. Provide AT LEAST 3 differences and 3
similarities.
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24. What is missing in the diagram? What bond is broken to release energy in this reaction? What type
of macromolecule is this? How do you know?
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25. Why do ecosystems constantly need an external source of energy (sun)?
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26. What is oxygen’s role in cellular respiration? What happens to oxygen when the reaction is over?
And what step of respiration does this occur in?
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27. How does the structure of the mitochondria contribute to the cellular respiration process?
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28. Is hydrolysis of ATP an anabolic or catabolic reaction? Clearly explain why!
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29. Clearly explain why ATP is such a good energy source for cells! Your response must discuss its
structure and how energy is released!
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30. Why can’t fermentation be used for primary energy production by cells? Give 2 reasons.
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31. What products of fermentation are toxic to cells in large amounts and why? Be specific in your
response.
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