Question

Incorrect Question 3 0/1 pts • How many turns of the Calvin cycle does it take to feed one molecule of glyceraldehyde-3-phosphate into the biosynthesis of glucose? Six One Two Three None of the other answers given

please answer and explain why. Thank You!

Answer 1

One turn of Calvin cycle results in fixation of one carbon dioxide. In three cycles, three molecules of carbon dioxide combine with three Ribulose-1,5-bisphosphate (RuBP) to form six molecules of glyceraldehyde-3-phosphate. Out of these 6 molecules, one exits the cycle to form glucose, and the remaining 5 molecules are recycled to generate RuBP.

Thus, 3 turns of Calvin cycle are needed to feed one molecule of Glyceraldehyde-3-phosphate into biosynthesis of Glucose.

(6 turns are needed to produce two Glyceraldehyde-3-phosphate, which will generate 1 glucose molecule).