If cells are grown in a medium containing radioactive 35S, which of these molecules will be labeled?

Name: If cells are grown in a medium containing radioactive 35S, which of these molecules will be labeled?
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Proteins contain sulfur amino acids, such as cysteine and methionine, which will be labeled with the radioactive 35S in the growth medium. The other molecules listed (phospholipids, nucleic acids, and amylose) do not contain sulfur and will not be labeled in this experiment.

If Cells Are Grown in a Medium Containing Radioactive 35S