Regarding Amino Acids, all statements are true except:

A Amino acids are the building blocks of Lipids.
B There are about 300 amino acids present in various animal, plant, and microbial systems, but only 20 amino acids are coded by DNA to appear in proteins.
C All amino acids in proteins are of the l -configuration because proteins are biosynthesized by enzymes that insert only l -amino acids into the peptide chains.
D The aromatic amino acids are responsible for the ultraviolet absorption of most proteins, which have absorption maxima ~280 nm.



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