PHOTOSYNTHESIS
THE CALVIN CYCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Detailed explanation-1: -A G3P molecule contains three fixed carbon atoms, so it takes two G3Ps to build a six-carbon glucose molecule.
Detailed explanation-2: -PGA is a 3 carbon compound. ATP and NADPH react with PGA to form PGAL. PGAL is a 3 carbon compound. Two PGAL combine to form a glucose.
Detailed explanation-3: -Why does it take three turns of the Calvin cycle to produce G3P, the initial product of photosynthesis? Because G3P has three carbon atoms, and each turn of the cycle takes in one carbon atom in the form of carbon dioxide.
Detailed explanation-4: -After three cycles, a three-carbon molecule of G3P leaves the cycle to become part of a carbohydrate molecule. The remaining G3P molecules stay in the cycle to be regenerated into RuBP, which is then ready to react with more CO2. Photosynthesis forms an energy cycle with the process of cellular respiration.
Detailed explanation-5: -Respiration of 1 molecule of glucose or 2 PGAL produces 38 ATP molecules, therefore 3 molecule of glucose, will produce 6 PGAL and 38×3=114 ATP molecules.