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Question

Which of the following statements are correct about α-amino acids:

A
All the amino acids which constitute proteins have D-configuration
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B
Isoelectric point of glycine is 6.1
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C
Valine is an essential amino acid
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D
In α-amino acids the basic group is (COO) and acidic groups is (NH3)
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Solution

The correct options are
B Isoelectric point of glycine is 6.1
C In α-amino acids the basic group is (COO) and acidic groups is (NH3)
D Valine is an essential amino acid
pKa1 and pKa2 of Glycine are 2.5 and 9.7 respectively so hence according to the formula pI=pKa1+pKa22 it comes out the pI for Glycine is 6.1.
Valine is an essential amino acid, hence it must be ingested, usually as a component of proteins. It is synthesized in plants via several steps starting from pyruvic acid.
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