8/3/2019 Photosynethesis and Respiration MC

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Photosynthesis and Cellular Respirationcontinued 

______5. When cells break down food molecules, energy

a. is released all at once.

b. is NOT converted into body heat and released.

c. is temporarily stored in ATP molecules.

d. causes excitation of electrons in chlorophyll molecules.

______ 6. A substance produced during the process of photosynthesis that

serves as the final electron acceptor for cellular respiration is

a. water.

b. ATP.

c. NADPH.

d. oxygen.

______ 7. When light is absorbed by a chlorophyll molecule, some electrons

are boosted to a higher energy level. These “excited” electrons

a. attach to two protons and an oxygen atom to form a water

molecule.

b. leave the chlorophyll and begin glycolysis.

c. pass through a series of electron transport chains in the thylakoidmembrane.

d. are transformed to protons by a proton pump.

______ 8. The energy used in the Calvin cycle for the production of 

carbohydrate molecules comes from

a. ATP made during cellular respiration.

b. the Krebs cycle.

c. ATP and NADPH made in the second stage of photosynthesis.

d. None of the above

______ 9. When muscles are exercised vigorously without sufficient oxygen

a. a lot of ATP is formed.

b. NADH molecules split.

c. lactic acid is produced.

d. fermentation produces ATP.

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Photosynthesis and Cellular Respirationcontinued 

______ 10. After proton pumps in mitochondria have depleted electrons of 

energy during ATP production,

a. the electrons carried as part of hydrogen ions are used in the

formation of water.

b. the electrons carried as part of hydrogen ions are used in the

formation of ethyl alcohol.

c. the electrons build up inside the mitochondria and diffuse back to

a thykaloid.

d. None of the above