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Where does the carbon dioxide released during cellular respiration come from?
ACarbons removed from the sugar
BOxygen taken in during breathing
CWater split inside the mitochondrion
DPhosphate groups stripped from ATP
Answer & Solution
Correct answer: A. Carbons removed from the sugar
1. The six carbons of glucose have to end up somewhere.
2. During the second stage of glucose metabolism, whenever a carbon atom is removed it is bound to two oxygen atoms, producing carbon dioxide.
3. The first such removal happens when pyruvate is converted to acetyl CoA.
4. All six carbon atoms from the original glucose molecule are eventually incorporated into carbon dioxide.
5. Inhaled oxygen ends up in water instead, at the end of the electron transport chain.
_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 7 'Cellular Respiration', sections 7.1-7.7_
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