<Li> Thick peptidoglycan layer </Li> <Li> Teichoic acids and lipoids are present, forming lipoteichoic acids, which serve as chelating agents, and also for certain types of adherence . </Li> <Li> Peptidoglycan chains are cross-linked to form rigid cell walls by a bacterial enzyme DD - transpeptidase . </Li> <Li> A much smaller volume of periplasm than that in Gram - negative bacteria . </Li>

What is gram + and gram - bacteria