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Question

Which of the following statements are correct about α-amino acids:
  1. All the amino acids which constitute proteins have D-configuration
  2. Isoelectric point of glycine is 6.1
  3. In α-amino acids the basic group is (COO) and acidic groups is (NH3)
  4. Valine is an essential amino acid

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

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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