(i) The interior of bacterial cell seems simple and granular because the membrane bound organelles are not present in it.
(ii) Mucilage, cell wall and plasma membrane are together called cell envelope.
(iii) Mucilage or glycocalyx gives gummy or sticky trait to cells.
Though it is not essential for bacterial survival, glycocalyx has several junctions
(a) Protection from dessication and toxins.
(b) Preventing host phagocytes to get attached to the bacterium.
(c) Holding cells together.
(d) Storing chemicals for virulence.