What is the product formed during the C3 cycle of the dark reaction?

The primary product formed during the C3 cycle (Calvin cycle) is glucose (C₆H₁₂O₆), a six-carbon sugar molecule. However, the immediate products and intermediates include:

Immediate Products:

• 3-Phosphoglycerate (3-PGA): First stable three-carbon compound formed when CO₂ combines with RuBP
• Glyceraldehyde-3-phosphate (G3P or PGAL): A three-carbon sugar that is the actual product of the Calvin cycle

Final Product:

• Glucose: Two molecules of G3P combine to form one glucose molecule
• For every 6 CO₂ molecules fixed, 12 G3P molecules are produced, but only 2 exit the cycle to form glucose while 10 are recycled to regenerate RuBP

Additionally, the glucose produced can be converted into starch for storage, sucrose for transport, or cellulose for structural purposes in plants. The C3 cycle requires 18 ATP and 12 NADPH molecules (produced during light reactions) to synthesize one glucose molecule from six CO₂ molecules.