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# Radiolabeled Carbon Dioxide and Fatty Acid Synthesis

BIOCHM-DSJH9S

A group of students goes out to lunch to celebrate one year with no accidents in their laboratories. Unfortunately, one student was too eager to celebrate and accidentally left open the valve to a container of ${CO}_{2}$ radio-labeled with $^{14}{C}$. The line ruptured, filling the lab with radioactive ${CO}_{2}$ which was inhaled by the group when they returned immediately after lunch.

Which one of the following compounds will be radioactively labeled by the $^{14}{C}$?

A

All of the carbon atoms of a newly-synthesized fatty acid.

B

Half of the carbons of a newly-synthesized fatty acid.

C

The carboxyl carbon of a newly-synthesized fatty acid.

D

About one-third of the carbons of newly-synthesized malonyl-CoA.

E

About one-half of the carbons of newly-synthesized acetyl-CoA.