PHOTOSYNTHESIS
LIGHT DEPENDENT REACTIONS
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[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: -Two turns are needed because glycolysis produces two pyruvate molecules when it splits glucose. Figure 5.9.
Detailed explanation-3: -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-4: -Energy from ATP and NADPH reduce the 3PG molecules to form another 3 carbon compound, glyceraldehyde-3-phosphate (G3P). Two G3P molecules are removed from the cycle and ultimately become one glucose molecule.
Detailed explanation-5: -It is produced from glucose during glycolysis. It is a three-carbon sugar. For every three molecules of CO2 reduced in the Calvin cycle, six molecules of G3P are formed but only one of these molecules exits the cycle to be used by the plant cell.