Researchers feed cells 14C-labeled acetyl-CoA (carbons marked).
On the FIRST turn of the cycle, where is the labeled carbon initially detected?
- A
Released immediately as CO2
- B
Released as O2 from oxaloacetate
- C
Stored permanently in NADH
- Dcheck_circle
In the citrate carbons; the labeled carbons are not released as CO2 in the first turn
Explanation
The CO2 lost during the first turn of the cycle comes from oxaloacetate carbons, not the newly added acetyl-CoA carbons. Labeled carbons are detected as CO2 only on later turns.