Name
Class
Date
9 Cellular Respiration
Multiple Choice
Write the letter that best answers the question or completes the statement on the line provided.
_____ 1. How do organisms get the energy they need?
a. by burning food molecules and releasing their energy as heat
b. by breathing oxygen into the lungs and combining it with carbon dioxide
c. by breaking down food molecules gradually and capturing their chemical energy
d. by using the sun’s energy to break down food molecules and form chemicals
_____ 2. Which of the following is the correct sequence of events in cellular respiration?
a. glycolysis → fermentation → Krebs cycle
b. Krebs cycle → electron transport → glycolysis
c. glycolysis → Krebs cycle → electron transport
d. Krebs cycle → glycolysis → electron transport
_____ 3. Which of these is a product of cellular respiration?
a. oxygen
c. glucose
b. water
d. lactic acid
_____ 4. Which process does NOT release energy from glucose?
a. glycolysis
c. fermentation
b. photosynthesis
d. cellular respiration
_____ 5. Unlike photosynthesis, cellular respiration occurs in
a. animal cells only.
c. prokaryotic cells only.
b. plant cells only.
d. all eukaryotic cells.
_____ 6. The starting molecule for glycolysis is
a. ADP.
c. citric acid.
b. pyruvic acid.
d. glucose.
_____ 7. Which of the following is NOT a product of glycolysis?
a. NADH
c. ATP
b. pyruvic acid
d. glucose
_____ 8. The Krebs cycle does NOT occur if
a. oxygen is present.
c. glycolysis occurs.
b. oxygen is not present.
d. carbon dioxide is present.
_____ 9. The Krebs cycle produces
a. oxygen.
c. carbon dioxide.
b. lactic acid.
d. glucose.
_____ 10. In eukaryotes, electron transport occurs in the
a. inner mitochondrial membrane.
b. nucleus.
c. cell membrane.
d. cytoplasm.
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Name
Class
Date
_____ 11. High-energy electrons that move down the electron transport chain ultimately provide the
energy needed to
a. transport water molecules across the membrane.
b. convert ADP molecules into ATP molecules.
c. convert carbon dioxide into water molecules.
d. break down glucose into pyruvic acid molecules.
_____ 12. Cellular respiration uses 1 molecule of glucose to produce approximately
a. 2 ATP molecules.
b. 4 ATP molecules.
c. 32 ATP molecules.
d. 36 ATP molecules.
Modified True/False
Indicate whether the statement is true or false. If false, change the underlined word or phrase to make
the statement true.
_____ 13. Cellular respiration releases energy by breaking down glucose in the presence of carbon
dioxide.
_____ 14. The reactants of photosynthesis are the same as the reactants of cellular respiration.
_____ 15. The Krebs cycle releases energy in the form of ATP.
_____ 16. Without the Krebs cycle, the electron transport chain cannot function.
Completion
Complete each statement on the line provided.
17. The original source of energy for all organisms in an ocean food chain is
18. Glycolysis alone nets only
molecules of ATP from each glucose molecule.
Short Answer
In complete sentences, write the answers to the questions on the lines provided.
19. What roles does oxygen play in photosynthesis and in cellular respiration?
20. Why is the Krebs cycle also known as the citric acid cycle?
.
Using Science Skills
Use the diagram below to answer the following questions on the lines provided.
A scientist set up a respiration chamber as shown below. She placed a mouse in flask B. Into flasks A,
C, and D, she poured distilled water mixed with the acid-base indicator phenolphthalein. In the
presence of CO2, phenolphthalein turns from pink to clear. She allowed the mouse to stay in the
chamber for about an hour.
Figure 9–2
21. Infer Write the equation for cellular respiration. Based on this equation and the setup shown in
Figure 9–2, what substance(s) would you expect the mouse in flask B to give off?
22. Interpret Visuals What will the mouse require to carry out cellular respiration? Look at the flasks
in Figure 9–2. Describe the flow of materials through the flasks. Will the mouse receive fresh air
so that it can survive?
23. Interpret Visuals Based on Figure 9–2, how will the scientist be able to detect whether the mouse
is carrying out cellular respiration?