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Calvin Cycle - Please Help!

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Calvin Cycle - Please Help!

Postby zsnow39 » Tue Dec 15, 2009 10:17 pm

Why can only 1 out of every 6 fixed carbon dioxide molecules be incorporated into making a carbohydrate in the Calvin Cycle?
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Postby jwalin » Wed Dec 16, 2009 1:14 am

the calvin cycle only needs 1( actually speaking 3 but only one to combine with RuBP) co2 but what do we get. we get a 3 carbon (triose phosphate). the other 3 c's are needed here and the other 2 are needed in taking another triose phosphate to rubp
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Postby JackBean » Wed Dec 16, 2009 11:06 am

In the cell, there are plenty of all the enzymes involved in the Calvin cycle and they run all the time. That is, there is "constant" flux in all these pathways.
Also, ALL of the fixed carbons are in result converted to some sugar and processed in further metabolism. If that wasn't the case, you would gain more intermediates leading to higher flux in other pathways.
On the other hand, if you wished to use more, than fixed carbons, you would deplete your intermediates, theoretically leading up to stopping of the Calvin cycle ;)
http://www.biolib.cz/en/main/

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Re:

Postby jwalin » Thu Dec 17, 2009 3:21 am

so what i thought was right.

:P
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Postby JackBean » Thu Dec 17, 2009 10:12 pm

was it?
http://www.biolib.cz/en/main/

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