following radiolabeled carbon in glucose

[Oh_Gee]

if a carbon on glucose were radio labeled, where would it end up after glycolysis, krebs cycle, and ETC?

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[Cawolf]

In the CO2 you exhale.

 

[Oh_Gee]

so both carbons of acetyl coa are converted to CO2?

 

[Cawolf]

The 2 Pyruvate are 3 carbon molecules that are converted to Acetyl, 2 carbon molecules (releasing 2 carbon as CO2).

Acetyl binds to CoA and enters the Krebs cycle and binds to Oxaloacetate (4) to form Citrate (6)

Through the Krebs cycle 2 CO2 are produced - returning to the base Oxaloacetate ready to accept another Acetyl.

So yes, through transition and the Krebs cycle, 6 carbons are released as CO2.

It is possible that the marked carbon is kept in the cycle and non-marked carbon is released - but I don't think that is how it works.