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Chapter 9: Cellular Respiration: Energy Releasing Pathways
Name
AP Biology
Date
Mr. Mennecke
1. True / False: Aerobic respiration occurs in animals but not in plants, which make ATP only by photosynthesis.
2. Is glycolysis energy-requiring or energy releasing? Explain.
3. In what respect does electron transport oxidative phosphorylation differ from substrate-level phosphorylation?
4. Glycolysis starts and ends in the
a. nucleus
b. mitochondria
c. plasma membrane
d. cytoplasm
5. Which of the following does not form during glycolysis?
a. NADH
c. FADH2
b. pyruvate
d. ATP
6. The pathway of aerobic respiration is completed in the
a. nucleus
c. plasma membrane
b. mitochondria
d. cytoplasm
7. In the last stage of aerobic respiration _____ is the final acceptor of electrons that originally resided in glucose.
a. water
c. oxygen
b. hydrogen
d. NADH
8. In alcoholic fermentation, _______ is the final acceptor of the electrons stripped from glucose.
a. oxygen
c. acetaldehyde
b. kinase
d. sulfate
9. Fermentation produces no more ATP beyond the small yield from glycolysis, but the remaining reactions
a. regenerate ADP
c. dump electrons on an inorganic substance (not oxygen)
b. regenerate NAD+
d. generate water
10. In certain organisms & under certain conditions, ________ can be used as an energy alternative to glucose.
a. fatty acids
c. amino acids
b. glycerol
d. all of the above
11. Match the event with its most suitable metabolic description.
Glycolysis
a. ATP, NADH, FADH2, CO2 & water form
fermentation
b. glucose to two pyruvate
Krebs cycle
c. NAD+ regenerated, 2 ATP net
oxidative phosphorylation
d. H+ flows through ATP synthase
12. The process of splitting larger molecules into smaller ones is an aspect of metabolism called
a. anabolism
c. oxidative phosphorylation
b. fermentation
d. catabolism
13. The synthetic aspect of metabolism is referred to as
a. anabolism
c. oxidative phosphorylation
b. fermentation
d. catabolism
14. A chemical process during which a substance gains electrons is called
a. oxidation
c. oxidative phosphorylation
b. reduction
d. dehydrogenation
15. The pathway through which glucose is degraded to pyruvate is referred to as
a. aerobic respiration
c. alcohol fermentation
b. glycolysis
d. the oxidation of pyruvate
16. The reactions of ___________ take place within the cytoplasm of eukaryotic cells.
a. glycolysis
c. chemiosmosis
b. oxidation of pyruvate
d. the electron transport chain
Chapter 9: Cellular Respiration: Energy Releasing Pathways
17. Before pyruvate enters the citric acid cycle, it is decarboxylated, oxidized, & combined with coenzyme A,
forming acetyl CoA, carbon dioxide, & one molecule of
a. NADH
c. ADP
b. FADH2
d. C6H12O6
18. In the process of ____________, electron transport and ATP synthesis are coupled by a proton gradient
across the inner mitochondrial membrane.
a. chemiosmosis
c. glycolysis
b. anaerobic respiration
d. substrate level phosphorylation
19. A net profit of only 2 ATPs can be produced anaerobically from the ___________ of one molecule of glucose,
compared with a maximum of 36 ATPs produced in _____________.
a. fermentation; anaerobic respiration
c. dehydrogenation; decarboxylation
b. aerobic respiration; fermentation
d. fermentation; aerobic respiration
20. When deprived of oxygen, yeast cells obtain energy by fermentation, producing carbon dioxide, ATP, and
a. acetyl CoA
c. pyruvate
b. ethyl alcohol
d. lactic acid
21. During strenuous muscle activity, the pyruvate in muscle cells may accept hydrogen from NADH to become
a. acetyl CoA
c. pyruvate
b. ethyl alcohol
d. lactic acid
22. Cyanide blocks the respiratory electron-transport chain. As a result
a. the Krebs cycle speeds up.
c. electrons and hydrogens cannot flow from NAD+ to oxygen.
b. glycolysis is inhibited.
d. three ATPs are produced for every pair of electrons.
23. With respect to the element carbon, respiration is a(n) _________ reaction.
a. dehydration synthesis
c. photosynthetic
b. hydrolysis
d. anabolic reactions
24. Respiration is important because
a. enzymes require it.
b. it conserves energy.
c. it recycles energy.
d. its heat helps to warm the environment.
25. When a muscle cell is metabolizing glucose in the complete absence of molecular oxygen, which one of the
following substances in not produced?
a. heat
c. lactic acid
b. ATP
d. acetyl-CoA
26. Germinating seeds are placed in a conical flask in setup A. Dry seeds are placed in setup B. A small tube
containing KOH is suspended in each flask. KOH absorbs carbon dioxide. Through the hole of the rubber
stoppered flasks, a bent glass tube is passed into a beaker of water. One end of each tube is in the flask
while the other end is in a beaker filled with water. Both apparatus are air tight. Note the level of water in the
tubes. Both apparatus are kept for some time and the positions of water in each tube are noted. It is
observed that water rises in the tube in setup A but not setup B.
a. What gas is being consumed in this process in flask A?
b. Why did water rise in the tube in setup A?
c.
Why did water not rise in the tube
in setup B?
d. What would happen if the setups
were not sealed from the
environment?
e. What would happen if KOH were
not used in these setups?
f.
What is the control for this
experiment?
Chapter 9: Cellular Respiration: Energy Releasing Pathways
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