Question

What is the first step of the process of urine formation?

• A. Oxidation of Ammonia
• B. Reduction of Ammonia
• C. Separation of Amino group from Amino acid
• D. Inclusion of Amino group to Amino acid

Answer 1

The correct option is B Reduction of Ammonia

A) Oxidation of ammonia does not take place.

B) The first step is the reduction of ammonia, removing free $H^{+}$ ions. ${NH}_3+H^{+}⟶{NH}_4^{+}$.

C) Amino acid glutamine is converted to glutamate by the separation of the amino group. $Glutamine\stackrel{Glutaminase}{\to }Glutamate+{NH}_4^{+}$
D) The inclusion of Amino group to Amino acid does not take place.

So the correct answer is 'Reduction of Ammonia'.