Question

in cellular respiration, carbon dioxide is formed from the oxidation of which of the following?
multiple choice
nadh
oxygen
glucose
water
cytochrome oxidase

Explanation:

Cellular respiration involves the breakdown of glucose ($C_6H_{12}O_6$). In the process, glucose is oxidized. Through glycolysis, the Krebs cycle (citric acid cycle), and the electron - transport chain, carbon atoms in glucose are gradually oxidized. For example, in the Krebs cycle, acetyl - CoA (derived from glucose breakdown) is oxidized, and carbon dioxide ($CO_2$) is released as a by - product. Water is a product of the electron - transport chain (when oxygen is reduced), oxygen is the final electron acceptor (not oxidized to form $CO_2$), NADH is an electron carrier (not a source of carbon for $CO_2$), and cytochrome oxidase is an enzyme (not a substrate for $CO_2$ formation).

Answer:

glucose