<prompt> Which of the following does not undergo phosphorylation by protein kinases in Eukaryotes:ThreonineTyrosineSerineAsparagine  <response>: D i.e. AsparagineSerine, threonine and tyrosine undergo phosphorylation by protein kinase in eukryotes during post translational modifications- Extra carboxyl group is added to glutamate residue of blood clotting protein prothrombin carboxylation. Lysine undergo methylation in some muscle proteins mono dimethyllysine, and calmodulin trimethyl lysine; carboxy group of glutamate undergo methylation removing their negative charge. 