BSC 310 Lecture Notes - Lecture 7: Polysaccharide, Flavobacteriia, Phototaxis

• School: University of Alabama
• Department: Biological Sciences
• Course: BSC 310
• Professor: Julie Olson

Document Summary

Movement toward or away from stimuli called taxes (plural: taxis is singular) (cid:1) (cid:1) (cid:1) Flagellum provides motility via swimming by rotating to push or pull the cell through liquid (cid:1) Long thin appendages attached to the cell at one end; so thin are difficult to see with light microscopy (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) Bacterial flagella can be attached to cells in various places. Tufts of flagella at both poles called amphitrichous. Flagella are helical with a constant distance between curves (called the wavelength) (cid:1) (cid:1) (cid:1) Flagellar filament is composed of many copies of the protein flagellin. Flagellin affects the shape, wavelength, and direction of rotation of the flagellum (cid:1) Flagellin is highly conserved across species, suggesting that flagellar motility is ancient (cid:1) Flagellum consists of several components and rotates, with the base structurally different than the filament (cid:1) (cid:1) (cid:1) (cid:1) The hook connects the filament to the motor in the base.