1. Bacteria

2. The Cell
is chemical system that is able to maintain its structure and reproduce. Cells are the fundamental unit of life.
All living things are cells or composed of cells.

3. CELL
PROKARYOTIC
EUKARYOTIC

4. EUKARYOTIC
Organisms whose cells normally contain a nucleus.
PROKARYOTIC
Organisms whose cells lack a nucleus and have no membrane-bound organelles.

5. EUKARYOTIC

6. PROKARYOTIC

8. The bacteria
(singular bacterium) are amongst the smallest organisms. They are most primitive, simple, unicellular and microscopic organisms. Bacteria occur almost everywhere : in air, water, soil and inside other organisms

9. Forms of bacteria
Bacilli
Spirilla
Vibrios
Cocci

15. Classification of Bacteria
Classification is based on stainability with the Gram stain
1-Gram positive bacteria
2-Gram negative bacteria

18. Gram-negative
Gram-positive
property
10 nm
20-80 nm
Thickness of wall 2 1
Number of layersin wall
10-20%
>50%
Peptidoglycan content - +
Teichoic acid in wall
58%
0-3%
Lipid and lipoprotein content 9% 0%
Protein content
13%
Lipopolysaccharide
Less sensitive
Yes
Sensitive to pencillin
Weakly
Digested by lysozyme