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..