Radioisotopes are frequently used to label molecules in a cell. The fate of atoms and molecules in a cell can then be followed. Assume Saccharomyces cerevisiae is grown in a nutrient medium containing the radioisotope ³²P. After a 48- hour incubation, the majority of the ³²P would be found in the S. cerevisiae's

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Phosphorus-32 is commonly incorporated into nucleic acids and phospholipids, which are major components of the plasma membrane.

Radioisotopes Are Frequently Used to Label Molecules in a Cell