15. The most important contribution of the citric acid cycle to energy metabolism is the extraction of high-energy electrons during the oxidation of acetyl CoA to CO2.
a. True
b. False
16. Each respiratory enzyme complex in the electron-transport chain has a greater affinity for electrons than its predecessors, so that electrons pass sequentially from one complex to another until they are finally transferred to oxygen, which has the greatest electron affinity.
a. True
b. False
17. The degradation and recycling of biological macromolecules occurs in the
a. Proteasome
b. Endoplasmic reticulum
c. Nucleus
d. Lysosome
e. Both a and d.
21. Which of the following is not true of the enzyme ribulose bis-phosphate carboxylase (RUBISCO):
a. It is responsible for photorespiration when O2 rather than CO2 is added to ribulose bis-phosphate
b. It is found in the stroma of the chloroplast
c. It âfixesâ CO2 to phosphoenolpyruvate to make oxaloacetate.
d. It is the most abundant protein on earth
22. Why do C4 plants have an elegant shuttle to increase CO2 concentrations near RUBISCO?
a. To maximize photorespiration (when plants take up O2 instead of CO2)
b. To minimize photorespiration (when plants take up O2 instead of CO2)
c. To maximize photophosphorylation (cyclic electron flow used to make ATP)
d. To minimize photophosphorylation (cyclic electron flow used to make ATP)
15. The most important contribution of the citric acid cycle to energy metabolism is the extraction of high-energy electrons during the oxidation of acetyl CoA to CO2.
a. True
b. False
16. Each respiratory enzyme complex in the electron-transport chain has a greater affinity for electrons than its predecessors, so that electrons pass sequentially from one complex to another until they are finally transferred to oxygen, which has the greatest electron affinity.
a. True
b. False
17. The degradation and recycling of biological macromolecules occurs in the
a. Proteasome
b. Endoplasmic reticulum
c. Nucleus
d. Lysosome
e. Both a and d.
21. Which of the following is not true of the enzyme ribulose bis-phosphate carboxylase (RUBISCO):
a. It is responsible for photorespiration when O2 rather than CO2 is added to ribulose bis-phosphate
b. It is found in the stroma of the chloroplast
c. It âfixesâ CO2 to phosphoenolpyruvate to make oxaloacetate.
d. It is the most abundant protein on earth
22. Why do C4 plants have an elegant shuttle to increase CO2 concentrations near RUBISCO?
a. To maximize photorespiration (when plants take up O2 instead of CO2)
b. To minimize photorespiration (when plants take up O2 instead of CO2)
c. To maximize photophosphorylation (cyclic electron flow used to make ATP)
d. To minimize photophosphorylation (cyclic electron flow used to make ATP)
