Question

Canvas Ā Help Center? biosynthesis of purine nucleotides and thymine metabolism of serine, glycine, methionine, and histidine. biosynthesis of formylmethionyl-tRNA. orrect Question 10 The sources of nitrogen in urea are Aspartate NH4 and carbamoyl phosphate NH, and glutamate NHA ous

Answer 1

The answer is 1st option - aspartate and 4th option - NH₄⁺

Urea is synthesized in the liver. It is also called carbamide. It is excreted out of the body in urine. Since urea has high nitrogen content, it is used as fertilizer. Urea CO(NH₂₎₂ )  is synthesized from ammonia and carbon dioxide. Urea has two amino (NH₂) groups and a joined carbonyl (C=O) group. One nitrogen of the NH₂ group comes from the NH₄⁺ (free ammonium ion) and the other nitrogen of the NH₂ group comes from the aspartate. So the sources of nitrogen atoms in the urea are aspartate and NH₄⁺.