Cellular Respiration WEB Practice
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1. Which of the following is NOT a product of cellular respiration?
a. glucose
c. water
b. carbon dioxide
d. ATP
2. Most of cellular respiration occurs in what organelle of a eukaryotic cell?
a. lysosome
c. nucleus
b. mitochondria
d. golgi body
3. Which of the following is released during cellular respiration?
a. oxygen
c. energy
b. air
d. lactic acid
4. Cellular respiration uses one molecule of glucose to produce
a. 2 ATP molecules.
c. 36 ATP molecules.
b. 34 ATP molecules.
d. 38 ATP molecules.
5. What is the correct equation for cellular respiration?
a. 6O2 + C6H12O6  6CO2 + 6H2O + Energy
b. 6O2 + C6H12O6 + Energy  6CO2 + 6H2O
c. 6CO2 + 6H2O  6O2 + C6H12O6 + Energy
d. 6CO2 + 6H2O + Energy  6O2 + C6H12O6
6. Glycolysis provides a cell with a net gain of
a. 2 ATP molecules.
c. 18 ATP molecules.
b. 4 ATP molecules.
d. 36 ATP molecules.
7. The starting molecule for glycolysis is
a. ADP.
c. citric acid.
b. pyruvic acid.
d. glucose.
8. Milk is converted to yogurt under certain conditions when the microorganisms in the milk produce
acid. Which of these processes would you expect to be key in the production of yogurt?
a. the Krebs cycle
c. alcoholic fermentation
b. photosynthesis
d. lactic acid fermentation
9. In the presence of oxygen, glycolysis is followed by
a. lactic acid fermentation.
c. photosynthesis.
b. alcoholic fermentation.
d. the Krebs cycle.
10. Cellular respiration is called an aerobic process because it requires
a. light.
c. oxygen.
b. exercise.
d. glucose.
11. Which organism is NOT likely to carry out cellular respiration?
a. tree
c. anaerobic bacterium
b. mushroom
d. tiger
12. In eukaryotes, electron transport occurs in the
a. mitochondria.
c. cell membrane.
b. chloroplasts.
d. cytoplasm.
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13. The energy of the electrons passing along the electron transport chain is used to make
a. lactic acid.
c. alcohol.
b. citric acid.
d. ATP.
14. Which process does NOT release energy from glucose?
a. glycolysis
c. fermentation
b. photosynthesis
d. cellular respiration
15. Photosynthesis is to chloroplasts as cellular respiration is to
a. chloroplasts.
c. mitochondria.
b. cytoplasm.
d. nuclei.
16. Unlike photosynthesis, cellular respiration occurs in
a. animal cells only.
c. all but plant cells.
b. plant cells only.
d. all eukaryotic cells.
17. What are the molecules used specifically by the cell to do cellular work?
a. lipids
c. proteins
b. glucose
d. ATP
18. The three main stages of cellular respiration are _____________________, the Krebs cycle, and
________________________.
19. What is cellular respiration?
20. List the three main stages of cellular respiration in order. Where does each stage take place in the
cell?
21. Cellular respiration is able to extract about 38 percent of the potential energy from glucose. What
happens to the rest of the energy? Give an example.
22. What role does oxygen play in the electron transport chain?
A student poured a solution of bromthymol blue indicator into three test tubes. Then, he placed an
aquatic plant in two of the test tubes, as shown below. He placed a stopper on each test tube and
placed them all in the dark for 24 hours. Bromthymol blue turns from blue to yellow in the
presence of CO2.
Figure 9–4
23. Applying Concepts Look at Figure 9–4. Which process or processes would you expect the
organisms in the test tubes to carry out—cellular respiration, photosynthesis, or both? When would
you expect each process to occur?
24. Inferring What is the purpose of the bromthymol blue in Figure 9–4? How can the student use this
indicator to draw conclusions about the processes that the aquatic plants are carrying out? Explain
your answer.
25. Predicting Predict what will happen to the test tubes in Figure 9–4 after 24 hours in the dark.
26. Predicting Assume that after 24 hours in the dark, the bromthymol blue in test tubes 2 and 3 in
Figure 9–4 had turned yellow. The student then placed test tube 3 in a sunny window. He left test
tube 2 in the dark. Predict what color the solution in each test tube will be after the next 24 hours.
27. Applying Concepts Explain your prediction in question 14 in terms of cellular respiration and/or
photosynthesis.
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18. ANS: glycolysis, electron transport
19. ANS:
Cellular respiration is the process that releases energy by breaking down food molecules in the
presence of oxygen.
20. ANS:
The three stages are as follows: glycolysis (which occurs in the cytoplasm), the Krebs cycle (which
occurs in the mitochondria), and electron transport (which occurs in the mitochondria).
21. ANS:
The rest of the energy is released as heat, as indicated by the fact that you feel warmer after
exercising and are able to maintain a constant temperature even in cold weather.
22. ANS:
Oxygen is the final electron acceptor in the electron transport chain, which means that it is needed
to get rid of low-energy electrons and H+ ions.
23. ANS:
Sample answer: When exposed to light, the aquatic plants will carry out both cellular respiration
and photosynthesis. After a time in the dark, the plants will carry out only cellular respiration.
24. ANS:
The purpose of the indicator is to detect the presence of carbon dioxide. The plants will give off
oxygen and take in carbon dioxide when they are carrying out photosynthesis. They will give off
carbon dioxide and take in oxygen when they are carrying out cellular respiration. If the plants
produce more carbon dioxide in cellular respiration than they are able to use, the indicator will
change from blue to yellow. If the plants produce and consume the same amount of carbon
dioxide, no new carbon dioxide will be produced and the indicator will not change color.
25. ANS:
The solution in test tubes 2 and 3 will turn yellow because the plants will give off CO2 from
cellular respiration but will not use it up through photosynthesis.
26. ANS:
After another 24 hours, test tube 2 will still be yellow. Test tube 3 will be blue again.
27. ANS:
Sample answer: The plant in test tube 2 remained in the dark and was not able to carry out
photosynthesis, so it did not use up carbon dioxide. The carbon dioxide keeps the bromthymol blue
yellow. However, the plant in test tube 3 was in the light, where it could carry out photosynthesis.
This plant used up the carbon dioxide, and without carbon dioxide the color of the bromthymol
blue turned back to blue.