In cellular respiration, a two-carbon molecule combines with a four-carbon

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RandomNormality

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Krebs cycle.

The 4-carbon molecule is oxacelotate (sp) and the 2 carbon is Acetate CoA.
 
molecule to form citric acid as par? in cellular respiration, a two-carbon molecule combines with a four-carbon molecule to form citric acid as part of

A.the Krebs cycle
B.the electron transport chain
C.carbon fixation
D.glycolysis
 
A.the Krebs cycle

The two carbon molecule you mention is Acetyl-CoA and the four carbon molecule is oxaloacetate. These two combine to form a six carbon molecule called citric acid....

please see the the image below to grab more....

http://upload.wikimedia.org/wikipedia/en/0/0b/Citric_acid_cycle_with_aconitate_2.svg
 
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