This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urea cycle, Subject name: Biochemistry
Which amino acid is regarded as collector of amino groups? 
Select and explain. 
A. Aspaate, B. Arginine, C. Cysteine, D. Glutamate
D: Glutamate
Answer: D: Glutamate 
Explanation: First step in catabolism of amino acids is the transfer of NH3 group from amino acid to Alpha Keto- Glutarate forming Glutamate- known as Transamination. So Glutamate is regarded as collector of amino groups. Note:-The safe non-toxic form of ammonia transpo in blood from most body tissues is Glutamine. Collector is Glutamate, transpoer is Glutamine