Structure of Gram-positive cell wall
The cell’s outer envelope is an organelle and physiological protection between the protoplasm (inside) of the cell and its external environment. The cell envelope guards bacteria from osmotic destruction and gives bacteria a rigid form. The cell envelope is composed of two elements that are a cell wall as well as a cytoplasmic or plasma membrane. It is a protective layer for the protoplasm composed of (i) the cytoplasm, (ii) inclusions in the cytoplasm (mesosomes, ribosomes and vacuoles, inclusion granules) and (iii) one circular DNA.