Which of the Following Amino Acids are Found at the C-Terminal

Question

Which of the following amino acids are found at the C-terminal domain of Pol II?
A) alanine and serine
B) alanine and glycine
C) glycine and threonine
D) serine and threonine

Accepted Answer

The C-terminal domain of Pol II is known to have multiple repeats of the consensus sequence YSPTSPS, which are phosphorylated during transcription. This consensus sequence contains the amino acids serine and threonine, therefore, the answer is D, serine and threonine.