Glycocalyx: Capsule or Slime layer? A.Components: sticky gelatinous polymer of polysaccharide and protein found on the outside of the cell wall. 1.Thick, highly organized, and solidly fixed to the cell wall, it is referred to as a capsule. 2.Thin layer, unorganized, loosely held to the cell wall it is referred to as a slime layer.
Glycocalyx B. Function: 1.Attachment: Allows the bacteria to attach to surfaces in its natural environment. 2.Protection: 1.Protect against dehydration 2.Protects against phagocytosis 3.Nutrition: 1.Keeps nutrients in the cell. 2.May be a source of nutrition
Flagella A.Components: 1.Filament: composed of proteins called flagellin that form the long hairlike structure that sticks out of the cell. (Not enclosed w/in the plasma membrane in prokaryotes) 2.Hook: wide structure that holds the filament and turns it like a propeller 3.Basal body anchors flagellum to the cell wall and plasma membrane.
B. Function of Flagella Propulsion and taxis (chemotaxis) 1.Runs and tumbles 2.Receptors for attractants and repellant
Types of Flagella Arrangement Monotrichous: a single flagellum at one end Amphitrichous: a single flagellum at both ends of the cell Lophotrichous: two or more flagella at one or both ends of the cell. Peritrichous: flagella all over the cell.