Question

urea is a by-product of the metabolism of _______ . enter answer

Explanation:

In biological metabolism, urea is produced from the breakdown of proteins (specifically the metabolism of amino acids, and more directly, the metabolism of nitrogen - containing compounds like proteins/amino acids, with a key focus on the metabolism of proteins or more precisely, the metabolism of amino groups from amino acids which leads to urea formation. The primary source related to urea production is the metabolism of proteins (or amino acids).

Answer:

proteins (or amino acids)