1. Metabolic Processes - Part III Photosynthesis
Test Review

2. Part A: True and False

3. The one thing that all photosynthetic organisms have in common is chlorophyll.
A. True B. False

4. The one thing that all photosynthetic organisms have in common is chlorophyll.
A. True B. False

5. The structure that connects stacks of thylakoids is the grana.
A. True B. False

6. The structure that connects stacks of thylakoids is the grana.
A. True B. False - channels (lamella)

7. During photosynthesis light energy is transferred to ADP and NADP+, forming ATP and NADPH. A. True B. False

8. During photosynthesis light energy is transferred to ADP and NADP+, forming ATP and NADPH. A. True B. False

9. The reactions of carbon fixation depend on the light reactions to supply ATP and NADPH.
A. True B. False

10. The reactions of carbon fixation depend on the light reactions to supply ATP and NADPH.
A. True B. False

11. Light energy is principally transferred by chlorophyll b. A. True B
Light energy is principally transferred by chlorophyll b. A. True B. False

12. Light energy is principally transferred by chlorophyll b. A. True B
Light energy is principally transferred by chlorophyll b. A. True B. False - chlorophyll a

13. Most plants are green because that is the colour of light they need for photosynthesis. A. True B. False

14. Most plants are green because that is the colour of light they need for photosynthesis. A. True B. False - the combination of pigments absorb light at the blue and red end of the spectrum and green is left to reflect back into our eyes

15. In comparing respiration and photosynthesis, respiration releases energy while photosynthesis stores energy. A. True B. False

16. In comparing respiration and photosynthesis, respiration releases energy while photosynthesis stores energy. A. True B. False

17. The source of electrons in photosynthesis is light. A. True B. False

18. The source of electrons in photosynthesis is light. A. True B
The source of electrons in photosynthesis is light. A. True B. False - water

19. The inner membrane of both the mitochondrion and the chloroplast is the site of their respective electron transport chains.
A. True B. False

20. The inner membrane of both the mitochondrion and the chloroplast is the site of their respective electron transport chains.
A. True B. False - electron transport chain of chloroplast is found in the thylakoid membrane

21. The location of the H+ reservoir in the chloroplast is the intermembrane space. A. True B. False

22. The location of the H+ reservoir in the chloroplast is the intermembrane space. A. True B. False - interior of thylakoid

23. Part B: Multiple Choice

24. Grana are formed from
a. stroma
b. photosystem
c. lamellae
d. thylakoids
e. reaction centres

25. Grana are formed from
a. stroma
b. photosystem
c. lamellae
d. thylakoids
e. reaction centres

26. In an investigation of the pigments in the leaves of a particular plant, one spot moved 8.0 cm from the origin, while the solvent front moved 10.0 cm. What would the Rf value of the pigment be?
a. 80.0
b. 8.0
c. 2.0
d. 1.25
e. 0.8

27. In an investigation of the pigments in the leaves of a particular plant, one spot moved 8.0 cm from the origin, while the solvent front moved 10.0 cm. What would the Rf value of the pigment be?
a. 80.0
b. 8.0
c. 2.0
d. 1.25
e. 0.8

28. Land plants get the CO2 they need for photosynthesis mostly from
breakdown of starch
carbonates in the soil
c. the atmosphere
d. carbon fixation in the roots
e. water via the roots

29. Land plants get the CO2 they need for photosynthesis mostly from
breakdown of starch
carbonates in the soil
c. the atmosphere
d. carbon fixation in the roots
e. water via the roots

30. Which one of the following is not a characteristic of the light reactions?
a. electrons are displaced
b. carbon fixation happens
c. reduction happens
d. energy is converted from a physical to a chemical form
e. they take place in the thylakoids of chloroplasts

31. Which one of the following is not a characteristic of the light reactions?
a. electrons are displaced
b. carbon fixation happens
c. reduction happens
d. energy is converted from a physical to a chemical form
e. they take place in the thylakoids of chloroplasts

32. Which of the following events of photosynthesis is concerned immediately with light?
a. production of ATP
b. fixation of carbon dioxide
c. transfer of energy from chlorophyll to carbon dioxide
d. excitation of chlorophyll
e. regeneration of chlorophyll

33. Which of the following events of photosynthesis is concerned immediately with light?
a. production of ATP
b. fixation of carbon dioxide
c. transfer of energy from chlorophyll to carbon dioxide
d. excitation of chlorophyll
e. regeneration of chlorophyll

34. A kind of herbicide works by disrupting the structure of the internal membranes of a chloroplast. Which segment of photosynthesis would be the most affected?
a. activation of the photosystems
b. reduction
c. absorption of light of chlorophyll
d. manufacture of ATP
e. evolution of oxygen

35. A kind of herbicide works by disrupting the structure of the internal membranes of a chloroplast. Which segment of photosynthesis would be the most affected?
a. activation of the photosystems
b. reduction
c. absorption of light of chlorophyll
d. manufacture of ATP
e. evolution of oxygen

36. Photophosphorylation specifically refers to the
a. synthesis of glucose via carbon fixation
b. splitting water as a result of light
c. synthesis of ATP by photolysis
d. reduction of NADPH by electron transport
e. synthesis of ATP using light

37. Photophosphorylation specifically refers to the
a. synthesis of glucose via carbon fixation
b. splitting water as a result of light
c. synthesis of ATP by photolysis
d. reduction of NADPH by electron transport
e. synthesis of ATP using light

38. Electrons released as a result of photolysis
a. combine with H+ ions and oxygen to form water
b. are used directly in the fixation of carbon during the Calvin cycle
c. reduce photosystem I chlorophyll molecules
d. reduce photosystem II chlorophyll molecules
e. oxidize NADP+

39. Electrons released as a result of photolysis
a. combine with H+ ions and oxygen to form water
b. are used directly in the fixation of carbon during the Calvin cycle
c. reduce photosystem I chlorophyll molecules
d. reduce photosystem II chlorophyll molecules
e. oxidize NADP+

40. Photon energy, captured by chlorophyll a, is transferred as chemical energy to
a. carbon dioxide
b. glucose
c. other chlorophylls
d. carotenoids
e. a series of hydrogen acceptors

41. Photon energy, captured by chlorophyll a, is transferred as chemical energy to
a. carbon dioxide
b. glucose
c. other chlorophylls
d. carotenoids
e. a series of hydrogen acceptors

42. When photosynthesis occurs, the oxygen that is released comes from
a. chlorophyll
b. an intermediate of the Calvin cycle
c. a carbohydrate
d. water
e. carbon dioxide

43. When photosynthesis occurs, the oxygen that is released comes from
a. chlorophyll
b. an intermediate of the Calvin cycle
c. a carbohydrate
d. water
e. carbon dioxide

44. What does carbon dioxide combine with during photosynthesis?
a. G3P
b. ribulose bisphosphate
c. ribulose
d. NAD+
e. water

45. What does carbon dioxide combine with during photosynthesis?
a. G3P
b. ribulose bisphosphate
c. ribulose
d. NAD+
e. water

46. Photorespiration occurs principally because of
a. elevated carbon dioxide levels in the leaves due to photosynthesis
b. elevated oxygen levels in the leaves due to cellular respiration
c. an increase in oxygenase activity relative to carboxylase activity as temperature increases
d. an increase in light intensity
e. none of the above

47. Photorespiration occurs principally because of
a. elevated carbon dioxide levels in the leaves due to photosynthesis
b. elevated oxygen levels in the leaves due to cellular respiration
c. an increase in oxygenase activity relative to carboxylase activity as temperature increases
d. an increase in light intensity
e. none of the above

48. There is a cost associated with the C4 pathway. This cost consists of
a. NADPH
b. NADH
c. cytochrome oxidation
d. ATP
e. none of the above

49. There is a cost associated with the C4 pathway. This cost consists of
a. NADPH
b. NADH
c. cytochrome oxidation
d. ATP
e. none of the above

50. Photosynthesis is important to the planet because it releases
a. both ATP and oxygen b. oxygen d. NADH
c. carbon dioxide e. ATP

51. Photosynthesis is important to the planet because it releases
a. both ATP and oxygen b. oxygen d. NADH
c. carbon dioxide e. ATP

52. In green plants, respiration takes place
a. only during the day time
b. only during the night time
c. all of the time
d. only in cells with no chlorophyll
e. only when photosynthesis stops

53. In green plants, respiration takes place
a. only during the day time
b. only during the night time
c. all of the time
d. only in cells with no chlorophyll
e. only when photosynthesis stops

54. Part C: Short Answer

55. What are the pigments most commonly found in the chloroplasts of leaves in higher plants?
Which of these are regarded as accessory pigments and why?
What are the advantages, if any, to a plant having several different pigments?

56. -. The main pigments found in the. leaves of higher plants are the
- The main pigments found in the leaves of higher plants are the chlorophylls (a and b and to a lesser extent c and d) and carotenoids.
- All but chlorophyll a are accessory pigments since only chlorophyll a is able to transfer the energy of light to the carbon fixation reactions.
- By having several different pigments a plant can absorb many different wavelengths of light most efficiently.

57. When sunlight strikes a leaf, what is the first thing that happens in terms of energy conversion?

58. A photon of light, of the correct wavelength, strikes a molecule of chlorophyll a in photosystem II, the molecule becomes excited. In this excited state, the chlorophyll is responsible for the splitting of a water molecule which makes hydrogen ions and electrons available, a source of chemical potential energy.

59. What are the roles of water and light in photosynthesis?

60. - Water is needed as a source of hydrogen ions and electrons which are used in reduction reactions.
- Light is needed as a source of energy to excite electrons of chlorophyll, which results in the splitting of water to form oxygen and release the hydrogen ions and electrons mentioned previously.

61. Outline the differences between cyclic and noncyclic photophosphorylation.

62. In cyclic photophosphorylation, the energized electron from photosystem I returns to photosystem I via the cytochrome carrier system. This produces ATP, but not NADPH.
In non-cyclic photophosphorylation both photosystems I and II energize an electron to a higher level. And this produces ATP as the electron goes through the cytochrome system and also produces NADPH.