Amino Acids & Proteins

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1.
The isoelectric point of alanine (pKa1 = 2.34, pKa2 = 9.69) is approximately:
2.
At pH 2, a neutral amino acid (pI = 6) exists predominantly as:
3.
Which amino acid does NOT have a chiral center?
4.
The peptide bond has partial double bond character due to:
5.
Which of the following is NOT an essential amino acid?

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