Which is not a true statement ?

Options

A. `alpha` - carbon atom of `alpha` - amino acids is asymmetric except in glycine
B. All proteins contain `alpha` - amino acids of L - configuration
C. Human body can synthesize all proteins they need
D. At pH = 7 both amino group and carboxylic group exists in the ionised form

Answer

D

Explanation

In acidic solution amino acid becomes positive ion and in basic solution negative ion