During cellular respiration, glucose and oxygen are used as reactants to produce energy in the form of ATP. There are three main stages - glycolysis in the cytoplasm produces 2 ATP and pyruvate, the preparatory reaction moves pyruvate into the mitochondria, and the electron transport chain uses oxygen as the final electron acceptor to produce the most ATP.

1. Cellular Respiration Practice

2. During cellular respiration, oxidation is the
result of the removal of _______ atoms
from substrates such as glucose.

3. Hydrogen

4. __________ and ________ are the
coenzymes that are present in cellular
respiration.

5. FAD and NAD+

6. The prep (transition) reaction takes place in
the:

7. Mitochondrial matrix

8. In the electron transport chain,
_____________ is the terminal electron
acceptor.

9. O2

10. The total ATP yield of cellular respiration is:

11. 36 or 38

12. In terms of its need for oxygen presence or
absence, glycolysis is a(n)
________________ series of reactions.

13. anaerobic

14. NADH produced during glycolysis is
transported and becomes part of which
phase of cellular respiration?

15. Electron transport chain

16. Which molecules are carrying high-energy
electrons during cellular respiration?

17. NADH and FADH2

18. The net production of ATP molecules from
glycolysis is:

19. 2 ATP

20. Where does the Krebs cycle occur?

21. Mitochondrial matrix

22. The coenzymes NADH and FADH2 are
carrying what to the electron transport
chain?

23. High energy electrons

24. After accepting the low energy electrons at
the end of the electron transport chain, O 2
reacts to form:

25. H 2O

26. Most ATP in eukaryotic cells is produced
where?

27. Mitochondria

28. Most ATP produced in aerobic respiration
occurs during what stage:

29. Electron transport chain

30. Which 2 stages of cellular respiration
produce CO2?

31. Preparatory reaction and Krebs cycle

32. During cellular respiration, ___________ is
oxidized and ___________ is reduced.

33. Glucose and oxygen

34. Why would 36 ATP be formed instead of 38
during cellular respiration

35. 2 ATP will be used to bring NADH into the
mitochondria from the cytoplasm

36. Products of glycolysis include:

37. NADH, ATP, pyruvate

38. The final electron acceptor in aerobic
respiration is:

39. Oxygen

40. Products of the Krebs cycle include:

41. Carbon dioxide, FADH2, NADH, and ATP

42. In the presence of oxygen, all cells
synthesize ATP via the process of
glycolysis. Many cells also can metabolize
pyruvate if oxygen is not present, via the
process of:

43. Fermentation

44. The net result (number of ATP) of the
breakdown of glucose in glycolysis and
fermentation is the production of:

45. 2 ATP

46. How many ATP molecules are produced
when one FADH2 donates electrons to the
ETC?

47. 2

48. Which stage of aerobic respiration requires
ATP?

49. Glycolysis

50. The correct order of the phases of cellular
respiration is

51. Glycolysis, prep reaction, Krebs cycle, ETC

52. How many ATP molecules are produced
when one NADH donates electrons to the
ETC?

53. 3

54. Respiration occurs in what organisms?

55. All organisms

56. Two possible ways for respiration to occur
is:

57. Fermentation and aerobic

58. Glucose is converted to pyruvate in

59. Glycolysis

60. Two hydrogen carriers involved in aerobic
respiration are

61. NAD+ and FAD

62. The role of oxygen in aerobic respiration is

63. Accept electrons at the end of the electron
transport chain and form water

64. What is the net gain in ATP molecules
produced during the reactions of glycolysis
under anaerobic conditions?

65. 2 ATP

66. When a muscle cell is metabolizing glucose
in the complete absence of molecular
oxygen, which substance is produced?

67. Lactate

68. Which part of respiration is common to both
anaerobic and aerobic metabolism?

69. Glycolysis

70. When glucose is broken down to carbon
dioxide and water during aerobic
respiration, more than 60% of its energy is
released as

71. Heat

72. Cellular respiration releases energy by
breaking down glucose in the presence of

73. Oxygen

74. The products of _________ are 2 ATP, 2
NADH, and 2 pyruvic acid molecules.

75. Glycolysis

76. What are the reactants in the equation for
cellular respiration?

77. Glucose and oxygen

78. During cellular respiration, what 3 parts do
require oxygen?

79. Preparatory stage, Krebs cycle, electron
transport chain

80. Where does glycolysis occur?

81. Cytoplasm

82. The starting molecule for glycolysis is

83. Glucose

84. What are possible products of fermentation?

85. CO2, alcohol, lactate

86. Location of the ETC.

87. Mitochondrial cristae

88. During which stage of cellular respiration is
no ATP produced?

89. Preparatory reaction

90. What two molecules act as an electron
carrier in cellular respiration?

91. NAD+ and FAD

92. During cellular respiration, which part does
not require oxygen?

93. Glycolysis

94. The energy of the electrons passing along
the electron transport chain is used to
make

95. ATP

96. Breathing heavily after running a race is
your body’s way of

97. Repaying an oxygen debt