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Identifying Macromolecules Using Radioactive Isotopes

APBIO-4NAHKY

A scientist is conducting an experiment in which she synthesized uridine triphosphate (uracil) using carbon-14 isotopes. She then adds the radioactively labeled molecules to the growth medium of a colony of living cells and allows the colony to incubate for 24 hours.

Upon examination, which of the following macromolecules should the scientist expect to be labeled inside the cell?

A

DNA.

B

RNA.

C

Proteins.

D

Monosaccharides.