B. Cell membrane Also named as cell membrane or cytoplasmic membrane It is a delicate trilaminar unit membrane . It accounts for 30% of the dry weight of bacterial cell. It is composed of 60% protein, 20-30% lipids and carbohydrate.
Function of cell membrane 1. Regulates the transport of nutrients and waste products into and out of the cell.
Synthesis of cell wall components
Assists DNA replication
Carries on electron transport system
Captures energy in the form of ATP
Cellular element enclosed with in the cell envelope
A. Mesosomes Convoluted invagination of cytoplasmic membrane often at sites of septum formation. It is involved in DNA segregation during cell division and respiratory enzyme activity.
B. Ribosomes Cytoplasmic particles which are the sites of protein synthesis. It is composed of RNA(70%) and proteins(30%) and constitutes 90% of the RNA and 40% of the total protein.