PHOTOSYNTHESIS
THE CALVIN CYCLE
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
1
|
|
|
2
|
|
|
3
|
|
|
4
|
Detailed explanation-1: -A molecule of glucose is made up of six carbon molecules. Therefore, six turns will be required for the synthesis of one molecule of glucose by Calvin cycle.
Detailed explanation-2: -Three turns of the Calvin cycle are needed to make one G3P molecule that can exit the cycle and go towards making glucose.
Detailed explanation-3: -Glyceraldehyde-3phosphate is abbreviated as G3P. It is the product that is then used to make glucose. Glyceraldehyde-3-phosphate is a three-carbon molecule, whereas glucose is a six-carbon molecule. One carbon cycle is fixed.
Detailed explanation-4: -Each turn of the Calvin cycle “fixes” one molecule of carbon that can be used to make sugar. It takes three turns of the Calvin cycle to create one molecule of glyceraldehyde-3 phosphate. After six turns of the Calvin cycle, two molecules of glyceraldehyde-3 phosphate can be combined to make a glucose molecule.
Detailed explanation-5: -Hence, for producing a net gain of 5 molecules of glucose 30 molecules of carbon are required. Hence 30 turns of the Calvin cycle are needed.