There are 20 amino acids that are found in living organisms. Thus, the correct option is D.
What are Amino acids?
Amino acids may be defined as the monomers of proteins that usually contain both a carboxyl (—COOH) and an amino (—NH2) group. These amino acids are joined together with the help of covalent peptide bonds to derive a polypeptides protein.
There are 20 amino acids that code for 61 codons. Three codons do not code for any amino acids. Amino acids are joined together by peptide bonds in order to construct a protein. There are at least 40 monomers of amino acids that must be present to formulate a protein.
Amino acids are classified into the polar or non-polar category depending on their nature and function. Some amino acids such as lysine (K) possess a very long side chain, while some amino acids like glycine (G) possess a very short side chain.
Therefore, there are 20 amino acids that are found in living organisms. Thus, the correct option is D.
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