The true statement about proteins is: it is made up of combinations of approximately 20 amino acids.
Proteins are the macromolecules consisting of amino acids as monomers. The amino acids are joined together by the peptide covalent bonds. The proteins are required for almost all the functions in the living body. the proteins are required as enzymes, signaling molecules, food component, etc.
Amino acids are the organic molecules that make up the protein. There are 20 different amino acids. All the amino acids have a common basic structure. It consists of a hydrogen atom, an amino group, a carboxylic group and a variable R group all attached to a α-carbon atom.
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