Thus, the cell wall can be several layers thick, each layer being a sheet of linked peptidoglycan units. The Gram-positive bacterial cell wall is distinguished by having multiple layers of peptidoglycan sheets and is thus up to ten times the thickness of a Gram-negative bacterial cell wall.
noun. A parson holding his Bible. A parson holding his Bible. The definition of a parson is a member of the clergy, particularly in the Anglican tradition. An example of a parson is a Protestant minister.
Definition of raison d'Ãªtre for English Language Learners : the thing that is most important to someone or something : the reason for which a person or organization exists Learn More about raison d'Ãªtre