Arrange the following steps of protein metabolism in correct sequence.
1) Ammonia is converted to urea in the liver.
2) Oxidative deamination of an amino acid.
3) Urea is eliminated by the kidney.
4) Ammonia and keto acids are formed.

A) 1, 3, 4, 2
B) 2, 4, 1, 3
C) 3, 1, 4, 2
D) 4, 1, 3, 2
E) 2, 3, 1, 4

Protein Metabolism

The process by which proteins are synthesized, broken down, and converted into other proteins or forms of energy within the body.

Ammonia

A colorless gas with a distinct, pungent smell, NH3, used in various industrial processes and also produced as a waste product in organisms.

Urea

A nitrogenous compound produced in the liver as a waste product of protein metabolism and excreted in urine.