The Calvin cycle: carbon fixation

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In very brief understandable way please. What is the Calvin cycle?what does it require? And what are it's steps with brief explanation. Thank you.
Oct 10th, 2014

The Calvin cycle is a set of chemical reactions that take place in the chloroplast during Photosynthesis. It is a light- independent reaction. It requires:

- RuBP, a 5C molecule

- Rubisco, an enzyme used to catalyse the C fixation and

- CO2

The following are the steps taking place in Calvin cycle:

- Carbon fixation: CO2 joins with RuBP with the help of enzyme Rubisco to form two 3C PGA molecules.

- Reduction: The 2 PGA molecules are converted to Phosphoglycerates and then to 6 PGAL molecules by using Phosphorus from ATP and Hydrogen from NADPH.

- Regeneration of RuBP: Out of the 6 PGAL molecules, 1 is used in the production of Sugar molecules (like Glucose)  while the other 5 are converted back to RuBP using ATP molecules.


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Oct 10th, 2014

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