Cell the unit of Life (2)
Mesosome is formed by extension of plasma membrane into the cell. Mesosome is a special membranous structure. Extension of plasma membrane are in the form of vesicles, tubules,lamellae. Bacterial flagella composed of three parts- Filament, Hook, Basal body Ribosomes- they are about 15 nm by 20 nm in size and made up of two sub units- 50s 30s Together form 70s. Ribosome are the site of protein synthesis. Several ribosomes may attach to a single mRNA and form a chain called polyribosome or polysome..