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. cerevisiaeʹs
A) cell wall.
B) water.
C) proteins.
D) plasma membrane.
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, after incubation, the majority of 32P would be incorporated into the phospholipids of the plasma membrane.

Radioisotopes Are Frequently Used to Label Molecules in a Cell