Which of the following amino acids has an ionizable R-group with a pK_a near neutral pH? A) histidine B) serine C) aspartic acid D) lysine E) tyrosine

Question

Quizplus · Accepted Answer

Histidine has an ionizable R-group (imidazole side chain) with a pKa near neutral pH (around 6.0), making it unique among the amino acids listed for its ability to serve as a proton donor or acceptor near physiological pH.

Which of the Following Amino Acids Has an Ionizable R-Group