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