Biochemistry Proteins and Amino Acids 7538b1cf Nitrogen atoms of Urea contributed by: A Ammonium and aspartate B Ammonium and glutamate C Ammonium and glycine D Ammonium and asparagine High-Yield Explanation Ans. A. Ammonium and aspartateFirst nitrogen by Ammonium ion--by the reaction CPS-1Second nitrogen by Aspartate--by the reaction Argininosuccinate Synthetase