Ch 8 Cellular Energy Exam
True/False
1. During the light-independent reactions of photosynthesis, light energy is used to split
water molecules generating protons and oxygen molecules.
2. C4 plants keep their stomata open during hot days to allow for sufficient uptake of
carbon dioxide to minimize water loss.
3. The first stage of cellular respiration, glycolysis, is an anaerobic process.
4. Glycolysis generates two ATP and two pyruvate. Only a small amount of the energy
from the glucose is contained in the pyruvate.
5. A prokaryote that grows and reproduces without oxygen is called aerobic.
6. Alcohol fermentation is similar to lactic-acid fermentation in that NADH donates
electrons during this reaction and NAD+ is regenerated.
7. Entropy is the measure of disorder, or unusable energy, in a system
8. Heterotrophs produce their own food.
9. Light energy is trapped and converted into chemical energy during the citric acid cycle.
10. Heat energy excites electrons in photosystem II.
Multiple choice…choose the best complete and accurate answer
11. During photosynthesis light energy is converted to the energy in chemical bonds.
What also happens according to the predictions of the second law of thermodynamics?
a. chemical energy is converted to light energy
b. matter is lost in the process
c. heat is released in the process
d. the light and chemical energy are equal
12. An organism that uses hydrogen sulfide as a source of energy is categorized as which
of the following?
a. photoautotroph
c. heteroautotroph
b. chemoautotroph
d. thermoautotroph
13. Which of the following metabolic pathways is anabolic?
a. photosynthesis
c. breakdown of actin in muscles
b. respiration
d. alcohol fermentation
14. What results from the removal of a phosphate group from ATP?
a. the production of mechanical energy
b. the release of energy
c. the creation of energy
d. the absorption of energy by chlorophyll
15. Infer why chloroplasts are found mostly in the leaves of plants.
a. The large surface area of leaves allows for maximum light absorption.
b. The waxy coating on the surface of leaves helps prevent evaporation.
c. Chlorophyll interferes with the xylem and phloem in the stems and trunks of
plants.
d. The large surface area of leaves allows for contact with oxygen.
16. Which of the following is an accurate summary of chemiosmosis?
a. Oxygen atoms diffuse down their concentration gradient out of the stroma into the
grana through ion channels in the membrane.
b. Hydrogen atoms diffuse down their concentration gradient out of the chloroplasts
into the thylakoid membrane.
c. Hydrogen atoms move up their concentration gradient through active transport out
of the thylakoid into the stroma through ion channels in the membrane.
d. Hydrogen atoms diffuse down their concentration gradient out of the thylakoid into
the stroma through ion channels in the membrane.
17. Which of the following is the second step of the Calvin cycle?
a. Molecular nitrogen is fixed into nitrate.
b. Two phosphate groups are joined to form glucose.
c. Chemical energy is transferred to 3-PGA molecules.
d. Rubisco converts organic carbon dioxide into inorganic molecules.
18. Predict the photosynthetic pathway that might be used by a saguaro cactus.
a. C4 pathway
c. C3 pathway
b. CAM
d. nitrogen fixation
19. The reactions of the Calvin cycle are not directly dependent on light, but they usually
do not occur at night. Which of the following statements explains why not?
a. The Calvin cycle depends on products of light reactions.
b. Carbon dioxide is not available at night.
c. It is too cold at night for reactions to take place.
d. Most plants do not make the 4-carbon compounds that would be needed for the
Calvin cycle to occur at night.
20. What happens when an aerobic organism is placed in an anaerobic environment?
a. Glycolysis stops, stopping the citric acid cycle.
b. The electron transport chain stops, stopping the citric acid cycle.
c. The citric acid cycle stops, stopping the electron transport chain.
d. The citric acid cycle stops, stopping glycolysis.
21. Where does the oxygen used in cellular respiration end up?
a. water
c. NADH
b. ATP
d. glucose
22. In what organisms does alcoholic fermentation take place?
a. yeast and some bacteria
c. fruit flies
b. viruses
d. plants
23. The movement of protons thru the ATP synthase channel to make ATP is called (A.
chemiosmosis B.hydrolisys).
24. Hydrogen ion concentration builds up in the(A. the thylakoid membrane B. thylakoid
space)
25. Light-absorbing colored molecules called (A.granna B.pigments) are found in the
thylakoid membranes of photosynthetic organisms.
26. Electrons move from photosystem II to I via (A. the calvin cycle B. The ETC)
27. CO2 combined with RubiscoBisPhosphate occurs in which phase (A. reduction B.
Fixation).
28. The balanced equation for photosynthesis is: 6CO2 + 6H2O --> C6H12O6 + (A. 6H2O
B. 6O2)
29. ATP is made of one adenine base, one ribose sugar, and (A. 2 B.3) phosphate groups.
30. NADPH and ATP are energy(A. transporting B. making) molecules.
Part II……………. Cellular respiration
31. The end product of glycolysis is
A) NADH
B) acetyl-CoA
C) lactate
D) pyruvate
32. The final output of the Krebs cycle includes all of the following except
A) NADP
B) NADH and FADH2
C) ATP
D) CO2
33. Where does the Kreb cycle occur?
A) in chloroplast
B) in cytoplasm of cells
C) in the mitochondria of cells
D) in the nucleus
34. Organisms that do not have the ability to produce or synthesize their own food are
called
A) anaerobic
B) autotrophs
C) exergonic
D) catabolic
E) heterotrophs
35. Glycolysis produces how much ATP totally?
A) 2
B) 3
C) 4
D) 10
E) 36
36. During what stage of cellular respiration is the most ATP synthesized?
A) glycolysis
B) oxidation of pyruvate
C) Krebs cycle
D) fermentation
E) chemiosmosis
37. Catabolic processes
A) make complex molecules from simpler ones
B) break complex molecules into simpler ones
C) occur only in autotrophs
D) occur only in heterotrophs
E) none of the above
38. During chemiosmosis in aerobic respiration, protons are pumped
A) out of the cell
B) out of the mitochondria into the cell cytoplasm
C) out of the mitochondrial matrix into the outer compartment of the mitochondria
D) out of the outer compartment into the matrix of the mitochondria
E) out of the nucleus and into the mitochondria
39. Which of the following organisms carries out cellular respiration?
A) a corn plant
B) a dog
C) a yeast
D) a bacterium
E) all of the above
40. Oxidizing which of the following substances yields the most energy?
A) proteins
B) glucose
C) fatty acids
D) alcohol
E) water
41. The oxidation of glucose to two molecules each of pyruvate, ATP, and NADH is
called ________ and occurs in the ________.
A) glycolysis; cytoplasm
B) fermentation; cytoplasm
C) the Krebs cycle; matrix of the mitochondrion
D) anaerobic respiration; cytoplasm
E) the respiratory electron transport chain; cristae of the mitochondrion
42. Which of the following is a waste product of Cellular respiration?
A) oxygen
B) citric acid
C) CO2
D) lactic acid
E) ATP
43. The Kreb cycle produces how many Hydrogens for each pyruvate?
A) 2
B) 3
C) 4
D) 5
E) 6
44. Which pathway for cellular respiration is located in the cytoplasm of the cell?
A) glycolysis
B) Krebs cycle
C) electron transport system
D) transition reaction
E) Calvin cycle
45. How many times does the Krebs cycle turn per glucose molecule?
A) once
B) twice
C) three times
D) four times
E) five times
46. What other transport molecule other than NAD can carry H+ ?
A) NADP
B) FAD
C) PADH
D) FADP
E) None of these
47. Which of the following statements is NOT correct about glycolysis?
A) Glycolysis takes place within the cytoplasm.
B) Glycolysis uses two ATP but forms four ATP, resulting in a net gain of two ATP
C) During glycolysis, two FADH are produced as substrate oxidation occurs.
D) Glycolysis begins with glucose and ends with four pyruvate molecules.
48. Pyruvate is the end product of the ______ reactions.
A) Krebs cycle
B) Calvin cycle
C) electron transport system
D) glycolysis
E) transition
49. Which of the following is another name for the Kreb cycle?
A) glycolysis
B) Citric Acid cycle
C) Redox cycle
D) Harley Davidson cycle
50. Which of the following overall equations represents aerobic cellular respiration?
A) C6H12O6 -----> 2 pyruvate + 2 ATP
B) 6 CO2 + 6 H2O + energy -----> C6H12O6 + 6 O2
C) C6H12O6 + 6 O2 -----> 6 CO2 + 6 H2O + energy
D) C6H12O6 -----> 2 lactate + 2 ATP
E) C6H12O6 -----> 2 alcohol + 2 CO2 + 2 ATP