Identify the pair of peptides below that CANNOT be distinguished by tandem mass spectrometry.

Question

Quizplus · Accepted Answer

The difference between the two peptides in option C is the second amino acid, which is isoleucine and serine, respectively. However, these amino acids have the same mass, and therefore cannot be distinguished by tandem mass spectrometry. The other answer choices can be distinguished based on differences in amino acid sequence.

Identify the Pair of Peptides Below That CANNOT Be Distinguished