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WCUPA / Biology / BIO 214 / Lipopolysaccharide contains what?

Lipopolysaccharide contains what?

Lipopolysaccharide contains what?

Description

School: West Chester University of Pennsylvania
Department: Biology
Course: Microbiology
Professor: Xin fan
Term: Spring 2016
Tags: Microbiology, Prokaryotic Cells, eukaryotes, and cells
Cost: Free
Name: Microbiology Lectures 4,5,6
Description: Covers all notes from power points, all key terms the professor emphasized during class, and extra notes. Great tool if you struggle with note taking or missed a class.
Uploaded: 12/24/2016
2 Pages 173 Views 0 Unlocks
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1/31/17

  • Lipopolysaccharide: contains lipid and sugar; referred to as LPS
  • Teichoic acid and LTA of gram
  • Gram + only
  • Polymers of glycerol
  • Polymer is extended inside end
  • 3 components of LPS
  • O- antigen: repeating oligosaccharides
  • Core region: polysaccharide
  • Lipid A: toxic properties
  • Importance of LPS
  • Protection from host defenses( immune response cells of human body)(o- antigen)
  • Contributes to negative charge on cell surface(core polysaccharide)
  • Stabilizes outer membrane structure(lipid A)
  • LPS is aka an endotoxin
  • Functions of cell envelope
  • Provides characteristic shape to cell
  • Protects cell from osmotic lysis
  • Contributes to pathogenicity
  • Protects cell from toxic substances
  • Cell envelope differences

        Gram+                                        Gram -Don't forget about the age old question of moodle 2 ull

Cytoplasmic membrane                Cytoplasmic membrane

Thick cell wall                                Thin cell wall

No other membrane                        Presence of outer membrane

TA and LTA                                LPSIf you want to learn more check out physics 101 notes
If you want to learn more check out How is boot verbs used?
If you want to learn more check out uf course
We also discuss several other topics like what is the direct source of energy for phototrophs
If you want to learn more check out What is meant by orthologs?

  • Cytoplasmic Matrix
  • Substance between membrane
  • Packed with ribosomes and indusing bodies
  • Highly organized with respect to protein location
  • Inclusion Bodies
  • Granules of organic or inorganic material that are stocked piled by the cell for future use
  • Some are enclosed by a single - layered membrane
  • Ribosomes
  • Found in all cells (eukaryotic and prokaryotic)
  • Known as
  • Complex structures consisting of protein and RNA
  • Site for protein synthesis
  • Prokaryotic is smaller than eukaryotic
  • Prokaryotic: 70 s (50S+30S)
  • Eukaryotic: 80 s (60S+40S)
  • S = Svedberg Unit (a unit off sedimentation rate during centrifugation)
  • Nucleoid (chromosome)
  • Irregularly shaped region
  • Location of chromosome
  • Usually 1 per cell
  • Not membrane bound, loosely in cytoplasmic space
  • Closed, circular, double - stranded DNA molecule
  • Looped and coiled extensively - called supercoiled
  • Plasmids
  • Usually small, closed circular DNA molecules
  • Exists in cytoplasmic space, but is independent from chromosome
  • Not required for growth and reproduction
  • Not essential structure for bacteria cell
  • Is also double - stranded
  • May carry genes that confer selective advantage (ex drug resistance)
  • Have lot of copies
  • Capsules and slime layers
  • Layers of material living outside the cell wall
  • Capsules
  • Usually composed of polysaccharides and not easily removed from cell
  • Slime layers
  • Similar to capsules except diffuse, unorganized and easily removed
  • Capsule
  • Discrete layer of polysaccharides surrounding the bacteria cell
  • Functions
  • Prevents harsh environmental conditions
  • Ex.: desiccation
  • Prevents phagocytosis (eating cell) and help invading host
  • Aid the bacteria adhere to the host
  • Assist in warding off attacks by phages
  • Flagella and Motility
  • Helps bacteria cell move around(rotate, not spinning)
  • Patterns of flagella arrangement
  • Monotrichous: 1 flagella
  • Lophotrichous: tuft at same end
  • Amphitrichous: both ends
  • Peritrichous: all around bacteria
  • Gram+: 2 different structures at base that is inserted in membrane structure, the hook extended out from cell wall
  • Gram- : 2 different ring structures at bottom and 2 rings in outer membrane
  • Secretion system: can secrete toxins out of body, very similar to flagella structure, protein goes to outside of cell though hook shape like in flagella structure in thre molecular level
  • Mechanism of Flagella Movement
  • Rotates like a propeller
  • Counterclockwise: rotation cases forward motion (run)
  • Clockwise: rotation disrupts run causing a tumble
  • Pili (fimbriae)
  • Short protein (pilin) appendages
  • Smaller than flagella
  • Adhere bacteria to surfaces
  • Tip structure contains adhesions
  • F - pilus
  • Used in conjugation
  • Exchanges of genetic information
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