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Calvin cycle: Quiz


Question 1: The two carbons on ________ are added to a G3P, giving the ketose xylulose-5-phosphate (Xu5P).
TransketolaseMetabolismPhosphopentose isomeraseTransaldolase

Question 2: These are dephosphorylated and the glucose can be used to form starch, which is stored in, for example, potatoes, or cellulose used to build up ________.
BacteriaCell envelopeChloroplastCell wall

Question 3: The ketose S7P has two carbons removed by transketolase, giving ribose-5-phosphate (R5P), and the two carbons remaining on ________ are transferred to one of the G3P, giving another Xu5P.
TransaldolasePhosphopentose isomeraseTransketolaseMetabolism

Question 4: F6P has two carbons removed by ________, giving erythrose-4-phosphate.
Phosphopentose isomeraseTransketolaseMetabolismTransaldolase

Question 5: The enzyme ________ catalyses the carboxylation of ribulose-1,5-bisphosphate, a 5-carbon compound, by carbon dioxide (a total of 6 carbons) in a two-step reaction.
Phosphoenolpyruvate carboxykinaseRuBisCOAcetoacetate decarboxylaseOrnithine decarboxylase

Question 6: ________ also reacts competitively with O2 instead of CO2 in photorespiration.
Phosphoenolpyruvate carboxykinaseOrnithine decarboxylaseAcetoacetate decarboxylaseRuBisCO

Question 7: The key enzyme of the cycle is called ________.
Ornithine decarboxylasePhosphoenolpyruvate carboxykinaseRuBisCOAcetoacetate decarboxylase

Question 8: Glucose, with ________, forms sucrose, a non-reducing sugar that, unlike glucose, is a stable storage sugar.

Question 9: ________ evolved to circumvent photorespiration, but can occur only in certain plants living in very warm or tropical climates.
Crassulacean acid metabolismC4 carbon fixationPhotosynthesisAdenosine triphosphate

Question 10: It was discovered by Melvin Calvin, James Bassham and Andrew Benson at the ________[1] by using the radioactive element, carbon-14.
University of California, IrvineUniversity of California, Los AngelesStanford UniversityUniversity of California, Berkeley


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