BI226 Lecture Notes - Lecture 2: Prokaryote, Vibrio, Chitin
Document Summary
Bi226 lecture 2: types of cells prokaryotes eukaryotes, prokaryotes. These cells thrive almost everywhere, e. g. too acidic, salty, cold or hot. Mostly microscopic more in a handful of fertile soil than the number of people who have ever lived. Structural and functional adaptations contribute to prokaryotic success: Two types of prokaryotes: bacteria, archaea cell surface structures: Cell wall maintains shape, provides physical protection, and prevents the cell from bursting in a hypotonic environment. Bacterial cell walls contain peptidoglycan (sugar polymers cross-linked by polypeptides). Archaea contain polysaccharides and protein but lack peptidoglycan. Gram stain used to classify bacterial species into gram-positive and gram negative groups based on cell wall composition.
