Question

Why does peptidoglycan contain the unusual D isomers of alanine and glutamic acid rather than the L isomers observed in proteins.​

Answer 1

Explanation:

Ok I understand your question

Generally in most of the organisms, amino acid are predominantly thought ti be synthesized and used as their L-enantiomers

The Unusual D-amino acid appear to modulate synthesis of peptidoglycan , a strong and elastic polymer that serves as stress bearing components of bacteral cell wall

Generally, D-amino acid have been associated to grow fitness and to process such as biofilm development, spore germination and signaling so D-amino acid are found in bacteria