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Which four of the following statements about amino acids are true? A chart of amino acid structures can be found here Alanine has an overall charge at physiological pH (7

Chemistry

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Which four of the following statements about amino acids are true? A chart of amino acid structures can be found here Alanine has an overall charge at physiological pH (7.4). Gin and Asn are polar amino acids. Threonine has more than one stereocenter (chiral center). The form of glycine used by the human body is D-glycine The Ala side chain does not form hydrogen bonds with other amino acids. Phe can undergo oxidation to form Tyr. Methionine is a thiol.