In the carbon reduction phase of the Calvin cycle, electrons from NADPH are donated to a metabolic intermediate to form G3P molecules.
Which statement is NOT true regarding G3P?
A.G3P molecules are involved in the regeneration of RuBP.
B.G3P molecules affect the activity of the enzyme rubisco.
C.G3P molecules have more potential energy than PGA molecules.
D.G3P molecules are used to synthesize glucose and other sugars.

The carbon from the carbon cycle gets fixed into sugars during a cycle of chemical reactions. It takes place in the plant's chloroplast. Fixation, reduction, and regeneration are the three fundamental phase of the Calvin cycle reactions .The enzyme RuBisCO and the molecule ribulose bisphosphate are both present in the stroma in addition to CO2 to start the Calvin cycle (RuBP). RuBP has two phosphate groups and five carbon atoms. RuBP reacts with CO2 to produce a six-carbon molecule, which is then split into two three-carbon compounds by the action of RuBisCO. Because CO2 is "fixed" from its inorganic state into organic molecules, this process is known as carbon fixation. The three-carbon compound 3-PGA is changed into another three-carbon compound called G3P by ATP and NADPH using their stored energy. This kind of reaction is referred to as a reduction reaction. There is a gain of an electron. To help produce the carbohydrate molecule, which is often glucose, one of the G3P molecules exits the Calvin cycle (C6H12O6). One carbohydrate molecule requires six rounds of the Calvin cycle to produce since it contains six carbon atoms (one for each carbon dioxide molecule fixed). Remaining G3P molecules renew RuBP, again allowing to get started with the carbon-fixation stage. Additionally, ATP is used to restore RuBP.

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