A biochemist wanted to study how various substances were...

A biochemist wanted to study how various substances were used in cellular respiration. In one experiment, she allowed a mouse to breathe air containing $\mathrm{O}_{2}$ "labeled" by a particular isotope. In the mouse, the labeled oxygen first showed up in a. ATP. b. NADH. c. $\mathrm{CO}_{2}$ d. $\mathrm{H}_{2} \mathrm{O}$

A biochemist wanted to study how various substances were used in cellular respiration. In one experiment, she allowed a mouse to breathe air containing $\mathrm{O}_{2}$ "labeled" by a particular isotope. In the mouse, the labeled oxygen first showed up in
a. ATP.
b. NADH.
c. $\mathrm{CO}_{2}$
d. $\mathrm{H}_{2} \mathrm{O}$

Key Concepts

Isotopic Labeling in Metabolic Studies

Isotopic labeling is a technique used in metabolic experiments to trace the path of atoms through biochemical reactions. By substituting a normal atom with its isotope, researchers can track the incorporation and fate of that atom in various metabolic products, providing insight into the dynamics of specific pathways.

Cellular Respiration

Cellular respiration is the process by which cells convert nutrients into energy in the form of ATP. It involves a series of metabolic reactions that include glycolysis, the citric acid cycle, and the electron transport chain, each playing a critical role in the overall energy production within aerobic organisms.

Electron Transport Chain

The electron transport chain is the final stage of cellular respiration, occurring in the inner mitochondrial membrane. It transfers electrons through a series of protein complexes, ultimately using molecular oxygen as the terminal electron acceptor to form water, which is crucial for maintaining the proton gradient needed for ATP synthesis.

Role of Oxygen as Terminal Electron Acceptor

In aerobic respiration, oxygen serves as the terminal electron acceptor in the electron transport chain. This role is vital because it allows the continuous flow of electrons through the chain, leading to the formation of water. Without oxygen, the chain would back up, preventing proper ATP production.

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