A person who is starving has a negative nitrogen balance because the amount of nitrogen excreted as a result of amino acid oxidation exceeds the amount the diet replaces.
Amino and carboxyl group functional groups can both be found in organic compounds known as amino acids. Alpha-amino acids, which are the building blocks of proteins and are among the hundreds of distinct amino acids found in nature, are the most widespread. There are just 22 alpha amino acids in the genetic code.
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