A yeast is cultured in the presence of radioactive phosphate and the following biological molecules are purified. Which molecule should be most radioactive?
A) RNA
B) Amino acids
C) An oligosaccharide
D) Fats
E) Proteins

Question

Quizplus · Accepted Answer

Radioactive phosphate is used to label nucleic acids like RNA, and as a result, RNA should be most radioactive. Amino acids, oligosaccharides, fats, and proteins do not contain phosphate and should not show significant radioactivity.

A Yeast Is Cultured in the Presence of Radioactive Phosphate