Friday, May 4, 2012

MICRO_BIO

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parts to Flagellum


1. Filament


. Hook


. Basal body





-flagellum doesn’t wip back and forth, it can rotate 60 degrees.


Flagella


- monotrichious - just one


- lophotrichious - small bunches from same part


- amphitrochious - flagella at both ends of bacteria


- peritricious- dispersed randomly over the surface of the cell





- bacteria with polar flagella are very speedy. Motility can be checked by putting bacteria under a microscope. Fast ones will move across the slide whereas slow ones will stay in one place.


Chemotaxis- a bacteria will move toward a good thing like chemicals such as food, and they will move away from bad things like toxic substances


- the flagella are responsible for the process of chemo taxis


- bacteria with fimbria adhere to their host causing the infection


-the gonococcus (gonorrhea) invades the genital urinary tract. E.Coli invades the intestine by these means.


- Pili are only on gram-negative bacteria and are involved in a mating process between cells so DNA is exchanged between the donor and recipient cell. Production of pili is controlled genetically.


- Spirochetes have internal flagella, Fimria have short


Micro map


Procaryatic cell


-Appendages - flagella, pili, fimrane


-Cell envelope - glycocolyx, capsule, slime layer, cell wall, cell membrane


-Protoplasm - cell pool, ribosomes, messosomes, granules, nucleud, chromatic bodies


Appendages Cell extentions


- appendages need something to stick to


- flagella and and axial filaments provide motility


- fimbraie and pili provide attachments


parts to Flagellum


1. Filament


. Hook


. Basal body


-flagellum doesn’t wip back and forth, it can rotate 60 degrees.


Flagella


- monotrichious - just one


- lophotrichious - small bunches from same part


- amphitrochious - flagella at both ends of bacteria


- peritricious- dispersed randomly over the surface of the cell





- bacteria with polar flagella are very speedy. Motility can be checked by putting bacteria under a microscope. Fast ones will move across the slide whereas slow ones will stay in one place.


Chemotaxis- a bacteria will move toward a good thing like chemicals such as food, and they will move away from bad things like toxic substances


- the flagella are responsible for the process of chemo taxis


- bacteria with fimbria adhere to their host causing the infection


-the gonococcus (gonorrhea) invades the genital urinary tract. E.Coli invades the intestine by these means.


- Pili are only on gram-negative bacteria and are involved in a mating process between cells so DNA is exchanged between the donor and recipient cell. Production of pili is controlled genetically.


- Spirochetes have internal flagella, Fimria have short, numerous strands, Pili have long, sparse appendages.


Cell Envelope


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