Catégories : Tous - prokaryotes - bacteria - archaea

par Zahid Azmi Il y a 11 années

290

Group 2

Prokaryotic organisms, which lack a cell nucleus, are classified into two main groups: Archaea and Bacteria. Archaea have distinct cell wall compositions without muramic acid and ester-linked branched fatty aliphatic chains in their membrane lipids, while their RNA lacks thymidine in tRNA.

Group 2

Group 2

Lipopolysacharide
Septic Shock/Endotoxin shock
Gram negative
Gram positive
Wall teichoic acid
Lipoteichoic acid

Structures external to the cell wall

Fimbriae and Pilli
Pili
Fimbriae
Axial filaments (endoflagella)
Eg- Treponema pallidum & Borrelia burgdorferi
Arrangements-Flagella
Types of Motility

Swarm

Tumbles

Subtopic
Monotrichous
Lophotrichous
Glycocaly
Slime layer
Capsules

Introduction to Prokaryotes

Procaryotes- organisms that lak a cell nucleus
Archaea

Cell wall w/o muramic acid

Membrane lipids- esther-linked banched fatty aliphatic chains

RNA w/o thymidine in tRNA

bacteria

Cell wall

Membrane lipid- ester linked straight chained acids

RNA

Size, shapes, and arrangements
Arrangement

vibrio, spirillum & spirochetes

Bacilli

Diplobacilli & streptobacilli

Cocci

Diplococci, staphylococci & streptococci

Shape

Additional shape

Unusual

Star-shaped, square & triangular

No fixed shape

Cellwall-less, eg- Mycoplasma Ureaplasma

Pleomorphic

Various shapes, eg- Corynebacteria

Spiral

Bacilllus

Coccus