This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of protein and amino acid, Subject name: Biochemistry
All of the following amino acids undergo transamination except? 
Select and explain. 
A. Arginine, B. Alanine, C. Proline, D. Glycine
C: Proline
Answer: C: Proline 
Explanation: All the amino acids undergo transamination except : Proline Lysine Threonine Hydroxyproline Transamination reaction interconves pairs of a-amino acids and a-keto acids. It is freely reversible and occurs a ping-pong mechanism. Pyridoxal phosphate (Vitamin B6) is the co-enzyme. It is impoant in the biosynthesis of non-essential amino acids. Reference: Harpers illustrated biochemistry 30th edition