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sample BIO question

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If 18O-labeled glucose is given to a rat, where will the

label first appear?


A. Exhaled O2

B. Exhaled CO2

C. Exhaled H2O

D. Plasma H2O

E. Intracellular H2O


the answer is B .... but during respiration is water formed as well

so why would it be CO2 and not H2O ?

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