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Vet and Animal Bio - Week 2 Lecture 2 (Prokaryotes (Structure (Genetic…
Vet and Animal Bio - Week 2 Lecture 2
Prokaryotes
Environment of sulphur, iron, phosphorous
First cellular life
Cyanobacteria
Production of O2
ocixatmosphere
greater energy efficeiency
Allowance for greater diversity
Importance
Greater structural, genetic diversity
High survivability
Essentail for life on earth
Used for biotechnology
Structure
Cell Wall = contains peptidoglycan, maintains cell shape, physical protection, prevents osmotic bursting
Gram staining
Gram positive = single cell membrane, thick peptiglycan
Gram negative bacteria = thin peptidoglycan, bilayered membrane
Cell Membrane
Capsule
Adhesion to substrate, cohesion, protection against host immune system
Surface filaments
Pili and fimbriae
flagellum
Genetic material
Nucleoid = bacterial chromosome
Ribosomal DNA in cytoplasm
DNA on plasmids
Diversity of life forms
Bacillus
coccobacillus
Bacteriology