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Question
How many molecules of ATP and NADPH are require in formation of two molecules of glucose? How many Calvin cycles are required?
How many molecules of ATP and NADPH are require in formation of two molecules of glucose? How many Calvin cycles are required?
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Solution
The correct option is A 36 ATP, 24 NADPH, 12 Calvin cycles
Total of 6 ATP and 6 NADPH molecules are required to form one molecule of glyceraldehyde-3-phosphate (G3P). Also, 3 ATP molecules are required to form ribulose bisphosphate (RuBP). To produce one molecule of glucose, two calvin cycles are required. Hence, for two calvin cycles, total of 18 ATP molecules and 12 NADPH molecules are required. For every three turns, one molecule of G3P exits the cycle to form half molecule of glucose. For every six turns, two molecules of G3P exits the cycle to form one molecule of glucose. Hence, for synthesis of two molecules of glucose, 12 turns of calvin cycles are required.Thus, the correct answer is option A.
Total of 6 ATP and 6 NADPH molecules are required to form one molecule of glyceraldehyde-3-phosphate (G3P). Also, 3 ATP molecules are required to form ribulose bisphosphate (RuBP). To produce one molecule of glucose, two calvin cycles are required. Hence, for two calvin cycles, total of 18 ATP molecules and 12 NADPH molecules are required. For every three turns, one molecule of G3P exits the cycle to form half molecule of glucose. For every six turns, two molecules of G3P exits the cycle to form one molecule of glucose. Hence, for synthesis of two molecules of glucose, 12 turns of calvin cycles are required.
Thus, the correct answer is option A.
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