EE Calculator Periodic Table Incorrect X Incorrect Question 9 of 15 a Sapling Le

Question

EE Calculator Periodic Table Incorrect X Incorrect Question 9 of 15 a Sapling Learning macmillan learning Which four of the following statements about amino acids are true? A chart of amino acid structures can be found here. Proline has an overall charge at physiological pH (7.4). Thr and Ser are polar amino acids Lysine has 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 V Methionine is a thio Phe can undergo oxidation to form Tyr

Explanation / Answer

pI of Proline is 6.30, pH (7.4) is greater than pI(6.30) so proline is present as more carboxylate ion form than ammonium ion form. So proline has overall charge at pH 7.4.

Hence this statement is true.

Thr and Ser are polar amino acids as they have OH group along with COOH and NH2.

So Ser and Thr are polar amino acids is true statement.

Lysine has one stereocenter it is true statement.

Alanine (Ala) has no polar group on side chain so it does not form hydrogen bonding. It is True.

Phenylalanine(Phe) undergoes oxidation to form Tyrosine (Tyr). It is True.

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