The Calvin cycle: carbon fixation

Biology
Tutor: None Selected Time limit: 1 Day

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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Oct 10th, 2014
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