Introduction

Function of cell membrane

1-Control on inflow of metabolites from cell by control on active transport of

molecules into cell because it has selective permeability.

2-Energy generation by oxidative phosphorylation.

3-Secretion of enzyme and toxin.

Synthesis of precursors of cell wall (have important role in synthesis of cell wall).

Nucleoid :- The bacterial genome consists of a single chromosome. It is not surrounded by nuclear membrane. Some bacteria have small, circular of DNA (plasmid) as free in cytoplasm.

Ribosome:- It is composed of several RNA and proteins. The 70s unit is composed of two small subunits (50s and 30s), while eukaryotic ribosome is consist of 80s (60s

and 40s).

Function of cell wall:

-Protection the internal structures.

-It maintains the shape of bacterial cell.

-Contain component which toxic to host cell.

- It plays a role in cell division

sujet TD 3 Master 2.pdf [pdf]