Which of the following amino acids does not belong to polar charged group?

Which of the following amino acids does not belong to polar charged group? Correct Answer Serine

Serine belongs to the category of polar uncharged amino acids whereas aspartic acid, lysine, glutamic acid and arginine belong to polar charged amino acids. These are fully charged at physiological pH and their side chains contain strong organic acids and bases.

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Natural proteins are composed primarily of 20 α-amino acids. Which one of the following statements is true for any of these amino acids in a solution of pH 1.5?