Bacteria

Single –celled organisms

Shape

Spherical– coccus

coccus, diplococcus,

streptococcus, sarcinae, tetrads, staphylococcus,

Rod-shaped

bacillus, diplobacillus,

streptobacillus

Spiral

Vibrio, spirillum, spirochete

Filamentous

Spherical– coccus: 0.5-2 μm

Rod-shaped: 1-10 μm

Spiral: 9-15 μm

Filamentous: 1-10 μm

Bacterial cell structure

Gram staining

Spores – a structure inside the bacterial cell that helps it survive harsh conditions e.g.: high or low temperature, radiation, lack of food, etc.

- Bacterial enzymes

-Synthesis and breakdown of organic matter

Bacterial growth-ensure the continuity of the species-minutes to hours

Microbiology – branch of science that studies the microorganisms

Bacteria Classification

Feed

ing

beha

vior phototrophs

chemotrophs

saprophytes

symbiotic

Bacteria Classification

O2 aerobes

anaerobes