If cells are grown in a medium containing radioactive ³⁵S, which of these molecules will be labelled?
A)phospholipids
B)nucleic acids
C)proteins
D)amylose
E)both proteins and nucleic acids

Question

Quizplus · Accepted Answer

Proteins contain sulfur-containing amino acids, such as cysteine and methionine, which can incorporate radioactive ³⁵S in the growing cells. Nucleic acids do not contain sulfur, so they would not be labeled with radioactive ³⁵S. Phospholipids and amylose are also unlikely to be labeled with radioactive ³⁵S, as they do not contain sulfur.

If Cells Are Grown in a Medium Containing Radioactive ³⁵S