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41

Biology

41. Photophosphorylation provides the Calvin-Benson cycle with
a. protons and electrons.
b. CO2 and glucose.
c. water and photons.
d. light and chlorophyll.
e. ATP and NADPH.

42. The enzyme ATP synthase couples the synthesis of ATP to
a. the diffusion of protons.
b. the reduction of NADP+.
c. the excitation of chlorophyll.
d. the reduction of chlorophyll.
e. CO2 fixation.

43. In both photosynthesis and respiration, protons are pumped across a membrane during
a. electron transport.
b. photolysis.
c. CO2 fixation.
d. reduction of O2.
e. glycolysis.

44. The chemiosmotic hypothesis states that the energy for the production of ATP comes from
a. the transfer of phosphate from intermediate compounds.
b. the reduction of NADP.
c. a proton gradient set up across the thylakoid membrane.
d. the oxidation of CO2.
e. Both a and b

45. The net energy outcome of cyclic photophosphorylation is
a. ATP.
b. ATP and NADH.
c. NADPH.
d. ATP and NADPH.
e. sugar.

46. Photosynthesis and respiration have which of the following in common?
a. In eukaryotes, both processes reside in specialized organelles.
b. ATP synthesis in both processes relies on the chemiosmotic mechanism.
c. Both use electron transport.
d. Both require light.
e. a, b, and c

47. Which of the following scientific tools "cracked" the Calvin-Benson cycle?
a. Radioisotopes
b. Paper chromatography
c. Crystallography
d. Centrifugation and electron microscopy
e. Both a and b

48. The energy source for the synthesis of carbohydrates in the Calvin cycle is
a. ATP only.
b. photons.
c. energized chlorophyll a.
d. NADPH + H+.
e. NADPH and ATP.

49. The Calvin cycle uses _______ to produce glucose.
a. CO2
b. ATP
c. NADPH
d. rubisco
e. All of the above

50. The enzyme rubisco is found in
a. chloroplasts.
b. mitochondria.
c. the cytoplasm.
d. the nucleus.
e. yeast.

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