Scale Bacteria vs. Eucaryotes
Bacteria vs. Eucaryotes
Three Cellular Domains
16S rRNA
Three Cellular Domains
Ribosome Image
Diversity of Bacterial Shapes
Coccus (pl. Cocci)
Diversity of Bacterial Shapes
Coccobacillus
Diversity of Bacterial Shapes
Vibrio
Diversity of Bacterial Shapes
Bacillus (pl. Bacilli)
Escherichia coli
Diversity of Bacterial Shapes
Spirillum
Diversity of Bacterial Shapes
Spirochete
Bacterial Cellular Arrangements
Filamentous Bacteria
Bacterial Anatomy (Overview)
Nucleoid
Endospores
Bacterial Anatomy (Cell Envelopes)
Gram Positive Cell Envelope
Gram Negative Cell Envelope
Lipopolysaccharide
Endosymbiosis
Mitochondrian
Chloroplast
Bacterial Anatomy (Plasma Membrane)
Plasma Membrane
Movement Across Membranes
water
Osmosis & Tonicity
Cell Walls
Plasmolysis
Protoplast & Spheroplast
Isotonic or Hypertonic medium
Hypotonic medium
A Protoplast is a Gram-Positive bacterium without its cell wall
A Spheroplast is a Gram-Negative bacterium lacking most of
its cell wall
Bacterial Anatomy (Flagella)
Flagellum (p. Flagella) (1/2)
also “atrichous”
Flagellum (p. Flagella) (2/2)
Taxis
Negative Chemotaxis is away from specific substances
Positive Chemotaxis is towards specific substances
Negative Phototaxis is away from light
Positive Phototaxis is towards light
Axial Filament (EndoFlagella)
Bacterial Anatomy (Pili)
Pilus (pl. pili) -- Fimbria
Sex Pili
Cell-Surface Fibrils
Electron micrograph of an ultra-thin section of a chain of
group A streptococci. The cell surface fibrils, consisting
primarily of M protein, are clearly evident. The bacterial cell
wall, to which the fibrils are attached, is also clearly seen as
the light staining region between the fibrils and the dark
staining cell interior. Incipient cell division is also indicated
by the nascent septum formation (seen as an indentation of
the cell wall) near the cell equator. The streptococcal cell
diameter is equal to approximately one micron.
Bacterial Anatomy (Glycocalyx)
Glycocalyx
Bacterial Anatomy (Overview)