BIOL 2900 Lecture Notes - Lecture 3: Prokaryote, Polysaccharide, Osmotic Shock

• School: York University
• Department: Biology
• Course: BIOL 2900
• Professor: Motti Anafi

Document Summary

All cellular like has the following characteristics in common. Cell membrane: regulate the flow of nutrients and wastes that enter and leave the cell. Long structures that extend beyond surface of cell. May be arranged differently depending on species. Responsible for movement: rotation propels bacteria through environment. Used in chemotaxis: movement towards (or away) from substances. Used by bacteria to adhere to one another, to hosts, and to substances in environment. May be hundreds per cell and are shorter than flagella. Fimbrae may be evenly distributed over entire surface used for attachment. Bacteria typically only have one or two per cell. Join two bacterial cells and mediate the transfer of dna from one cell to another (conjugation) Sticky substances surrounding the outside of the cell. Almost always observed on the surface of cells growing in nature (as opposed to the laboratory) Mediate adherence of cells to each others and to surfaces.