Transamination is a process which nonessential AA are made. Only two AA are strictly ketogenic. Four AA are both glucogenic and ketogenic. These include isoleucine, phenylalanine, tyrosine and tryptophan. All other AA are glucogenic.
Urea cycle requires the coordination of two different tissues.
Kidney synthesize arginine from citrulline and carbamyl phosphate, and liver break down arginine into urea and ornithine.