Archaea Flashcards
Archae have cell walls composed of
polysaccharides or protein
Do archea possess true peptidoglycan structure
NO, some lack a cell wall entirely
- Found in gram-negative bacteria
- Has signaling molecules and receptors
- Endotoxin
Lipopolysaccharide
Found in Gram-negative bacteria
- special membrane channels that only allow certain chemicals to penetrate
Porin proteins
Treatment of infections caused by gram-negative bacteria requires
drugs that can cross the outer membrane.
A lipid bilayer with proteins embedded.
Serves as a site for:
Energy reactions
Nutrient processing
Synthesis
Regulates transport of nutrients and wastes
Selectively permeable: special carrier mechanisms for passage of most molecules
Cytoplasmic membrane
Naturally lack a cell wall
Sterols in the cell membrane stabilize the cell against lysis,
Mycoplasma pneumoniae: “walking pneumonia”
Mycoplasmas
Some bacteria that naturally have a cell wall but lose it during part of their life cycle.
Role in persistent infections
Resistant to antibiotics
L-forms
