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
A)plasma membrane.
B)cell wall.
C)water.
D)proteins.
E)carbohydrates.

Question

Quizplus · Accepted Answer

³²P is a radioactive isotope of phosphorus, which is a key component of nucleic acids and phospholipids. In Saccharomyces cerevisiae, it would primarily be incorporated into the phospholipids of the plasma membrane.

Radioisotopes Are Frequently Used to Label Molecules in a Cell