Question

Which of the following statements about amino acids is false?

• A. Based on the nature of carboxyl group there are many amino acids
• B. Amino acids are substituted methanes
• C. Amino acids have an amino group and acid group as substituents on the $\alpha$-carbon
• D. Tryptophan is an aromatic amino acid
  

Answer 1

Answer: (A)

Based on the nature of carboxyl group there are many amino acids

a) R group on the side chain on the amino acid provides variation. The statement is false.

b) The side chain of amino acid has R group which is variable and has substituted methane. For, example lysine. The statement is true.

c) Amino acids have an amino group and acid group as substituents on the alpha carbon while the carboxyl group are present on the terminal end. The statement is true.

d) Tryptophan is a aromatic amino acid which acts as a precursor to the neurotransmitter. It helps in biosynthesis of proteins. It also helps in the synthesis of niacin and auxin. The statement is true.

So, the correct answer is option A.