Question

Which one of the following statements about amino acid is not true

• A. They are constituents of all proteins
• B. Alanin having one amino and one carboxylic group.
• C. Most naturally occuring amino acids have D-configuration
• D. Glycine is the only naturally occuring amino acid which is optically inactive

Answer 1

Answer: (C)

Most naturally occuring amino acids have D-configuration

$\text{All naturally occurring proteins from all living organisms consist of L amino acids. Most naturally occurring}$ $\text{chiral amino acids are S, with the exception of cysteine.}$

Hence, C is not true.