When does the light-independent Calvin-Benson cycle of photosynthesis cycle begin?

As it is a cycle of reactions you can start anywhere in the cycle. However it is probably easiest to understand the cycle by dividing it into three stages, starting with the fixation of carbon dioxide (CO 2 ) 1) The Fixation Stage When CO 2 diffuses into the stroma of the chloroplast it combines with a carbon dioxide acceptor molecule called ribulose 1, 5 -bisphosphate. Two molecules of a substance called glycerate 3-phosphate are produced.

This reaction is catalysed by an enzyme called RuBisCO 2) The Reduction Stage The ATP and NADPH from the light-dependent stage are used to convert the glycerate-3-phosphate into glyceraldehyde 3-phosphate 3) The Regeneration Stage In a series of reactions, most (5/6) of the glyceraldehyde 3-phosphate is used to produce more ribulose bisphosphate to allow the cycle to continue. The rest (1/6) is used to make all of the carbohydrate and other organic compounds which the plant needs For more details see: en.wikipedia.org/wiki/Calvin_cycle users.rcn.com/jkimball.ma.ultranet/Biolo... For an animation of the process see: http://www.science.smith.edu/departments/Biology/Bio231/calvin.html.

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