AP BIOLOGY

PHOTOSYNTHESIS

THE CALVIN CYCLE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
How many times must the Calvin Cycle “turn” in order to make one molecule of glucose?
A
1
B
2
C
4
D
5
E
6
Explanation: 

Detailed explanation-1: -One turn of Calvin cycle fixs only one carbon (of the carbon dioxide). 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: -It would take six turns of the cycle, or 6 CO2start text, C, O, end text, start subscript, 2, end subscript, 18 ATP, and 12 NADPH, to produce one molecule of glucose.

Detailed explanation-3: -Because the carbohydrate molecule has six carbon atoms, it takes six turns of the Calvin cycle to make one carbohydrate molecule (one for each carbon dioxide molecule fixed).

Detailed explanation-4: -We know that glucose is a 6-carbon compound, so 6 molecules of carbon dioxide are needed to make one molecule of glucose. Hence, six turns of Calvin Cycle are required to generate one mole of glucose.

Detailed explanation-5: -Glucose is a six carbon molecule. G3P is a three carbon molecule. Therefore it takes two cycles of the Calvin cycle to create enough sugar to form glucose.

There is 1 question to complete.