Multiple Choice
How does rubisco "decide" whether to act as an oxygenase or a carboxylase?
A) Rubisco has 10 times more affinity for O2 than CO2; therefore, it favors O2 fixation.
B) If O2 is relatively abundant, rubisco acts as a carboxylase.
C) If O2 predominates, rubisco fixes it and the Calvin-Benson cycle occurs.
D) Photorespiration is more likely at low temperatures.
E) As the ratio of CO2 to O2 falls in the leaf, the reaction of rubisco with O2 is favored, and photorespiration proceeds.
Correct Answer:
Verified
Correct Answer:
Verified
Q28: Rubisco has both carboxylase and oxygenase activities.
Q29: Photorespiration<br>A) results in CO<sub>2</sub> fixation.<br>B) uses ATP
Q30: The enzyme rubisco is found in<br>A) chloroplasts.<br>B)
Q31: Plants are green because<br>A) chlorophylls absorb blue
Q32: Cyclic and noncyclic electron flow are used
Q34: Which of the following biological groups is
Q35: _ uses pipes to release CO<sub>2</sub> around
Q36: Which of the following begins the Calvin
Q37: How many moles of CO<sub>2</sub> must enter
Q38: The O<sub>2</sub> found in Earth's atmosphere is