Check the TRUE alternative in relation to amino acids and proteins: (a) the precipitation of a protein is always an irreversible process (b) the isoelectric point of amino acids with non-ionizable side chain is reached at neutral pH (= 7) (c) all the amino acids that make up our proteins have a chiral carbon whose configuration is (S) (d) denaturation affects all structural levels of proteins (e) all amino acids are soluble in water and have relatively high melting points

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