Q. The amino acid in which R group is $- C H_{2} - C H_{2} - COO H$ is

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A

aspartic acid

B

glutamic acid

C

valine

D

threonine

Solution:

Amino acid contain a variable part 'R' due to which different types of amino acids are seen. This R can any aliphatic or aromatic chain. If R contains COOH then such amino acids are acidic amino acids. Examples are Glutamic and Aspartic acids. In Glutamic acids, R is $- C H_{2} - C H_{2} - C H_{2} - COO H$ while in Aspartic acid R is $- C H_{2} - COO H$ .