Link reaction in respiration Watch

JacobBob
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I understand that pyruvate is decarboxylated but does that mean that carbon is taken from it and then combined with atmospheric oxygen to produce C02 or does it mean that both C and O are taken from pyruvate to release CO2 ?
And if it was the latter then both link rxn and the krebs cycle don't need oxygen no ?
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googie3
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the latter is right.....link rxn and krebs dont need oxygen...only last step that is oxidative phoshphorylation needs oxygen
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Jpw1097
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(Original post by JacobBob)
I understand that pyruvate is decarboxylated but does that mean that carbon is taken from it and then combined with atmospheric oxygen to produce C02 or does it mean that both C and O are taken from pyruvate to release CO2 ?
And if it was the latter then both link rxn and the krebs cycle don't need oxygen no ?
The CO2 is derived entirely from pyruvate, no oxygen is required. Pyruvate is a carboxylate, meaning it has a carboxyl group (COO- group). This COO- group can be cleaved off pyruvate and rearranged to form CO2 and pyruvate now becomes an acetyl group which combines with coenzyme A to form acetyl-CoA. As googie3 has said, oxygen is only needed in oxidative phosphorylation where it is the terminal electron acceptor in the electron transport chain.
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