MICRO 06 Lect 4

MICRO 06 Lect 4 - The Prokaryotes Sofronio Agustin...

Info iconThis preview shows pages 1–15. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: The Prokaryotes Sofronio Agustin Professor LECTURES IN MICROBIOLOGY LESSON 4 2 Lesson 4 Topics External Structures Cell Envelope Internal Structures Cell Shapes, Arrangement, and Sizes Classification 3 External Structures Flagella Pili and fimbriae Glycocalyx 4 Flagella Composed of protein subunits called flagellin . H antigens used in serotyping of bacterial strains. Example: Escherichia coli O157: H7 5 Flagellar Structure Three components of a flagellum: filament, hook and basal body 6 Flagellar Arrangement (a) Monotrichous (b) Lophotrichous (c) Amphitrichous (d) Peritrichous 7 Bacterial Motility The rotation of the flagella enables bacteria to be motile. 8 Chemotaxis Chemotaxis is the movement of bacteria in response to chemical signals. It consists of a series of tumbles and runs toward or away from source of stimuli. 9 Endoflagella Spirochetes have their flagella embedded in the membrane = endoflagella Also called axial filament Example: T. pallidum (corkscrew motility) 10 Pili and Fimbriae Attachment Mating (Conjugation) 11 Fimbriae Fimbriae are smaller than flagella and are important for attachment. 12 Pili Pili enable conjugation to occur, which is the transfer of DNA from one bacterial cell to another (mating). 13 Glycocalyx Capsule Protects bacteria from phagocytic cells Slime layer Enable attachment and aggregation of bacterial cells 14 Capsule The capsule is covalently bound to the cell wall....
View Full Document

Page1 / 49

MICRO 06 Lect 4 - The Prokaryotes Sofronio Agustin...

This preview shows document pages 1 - 15. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online