2023-05-17T21:27:48+03:00[Europe/Moscow] en true <p>•Appendages may provide motility</p>, <p>•Appendages allow for attachment to surfaces</p>, <p><strong>Gram Negative vs Gram Positive Cells</strong></p>, <p><strong>Cell Membrane</strong></p>, <p>-Thick peptidoglycan layer</p><p>-Outer membrane</p><p>-Cell membrane determines shape of bacteria</p><p> (gram neg or positive)</p>, <p>-Cell wall prevents entry of small molecules</p><p>-Cell membrane composed of phospholipids and proteins</p><p>-Generally harder to kill with antibiotics</p><p>-Less permeable to small molecules</p><p> (gram neg or positive)</p>, <p><strong>Within the Cell </strong>Cytoplasmic matrix, Nucleoid, Cytoskeleton</p>, <p><strong>Ribosomes</strong></p>, <p><strong>Inclusions</strong></p>, <p><strong>Endospores</strong></p>, <p>What is true about endospores?</p>, <p>•95% of bacteria are found in one of three shapes</p>, <p><strong>Bacterial Arrangement</strong></p>, <p>Rods divide only along</p>, <p>A coccus that divides on random planes of division (front to back, top to bottom, left to right…) will likely produce</p>, <p><strong>Bacterial Size </strong>Coccus, Bacillus, Spirillum</p>, <p>classification </p>, <p>•Bergey’s manual of Systematic Bacteriology &amp; Medical Microbiology System</p> flashcards
micro ch 4

micro ch 4

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  • •Appendages may provide motility

    •Flagella

    •Axial filaments

  • •Appendages allow for attachment to surfaces

    •Fimbriae

  • Gram Negative vs Gram Positive Cells

    Neg- has outer membrane, thin peptidoglycan

  • Cell Membrane

    •Composed of phospholipids and proteins

    •Responsible for selective permeability

  • -Thick peptidoglycan layer

    -Outer membrane

    -Cell membrane determines shape of bacteria

    (gram neg or positive)

    pos

  • -Cell wall prevents entry of small molecules

    -Cell membrane composed of phospholipids and proteins

    -Generally harder to kill with antibiotics

    -Less permeable to small molecules

    (gram neg or positive)

    fill in

  • Within the Cell Cytoplasmic matrix, Nucleoid, Cytoskeleton

    •Cytoplasmic matrix provides water for biochemical reactions

    •Nucleoid contains genetic material

    •Cytoskeleton provides support

  • Ribosomes

    •Responsible for protein synthesis

    •Prokaryotic  ribosomes 30S + 50S = 70S

  • Inclusions

    •Contain stores of nutrients

  • Endospores

    •Survival structures formed by bacteria in the genera Bacillus and Clostridium

    • in response to poor growth conditions

    •Resistant to heat, cold, chemicals, radiation…

    -special staining technique

  • What is true about endospores?

    a)Found in Bacillus and Clostridium

    b)May survive 1000’s of years

    a)Aid in attachment to body surfaces(false)

    d)Protect the cell against dehydration(false)

    e)Produced in response to heat, cold, or radiation(false)

  • •95% of bacteria are found in one of three shapes

    cocci, bacilli(rod), spirals(spirillum & spirochetes)

  • Bacterial Arrangement

    •Dependent on division of individual cells.  Cocci have more arrangements than rods 

    •Division along multiple planes produce more complex arrangements (random cuts)

  • Rods divide only along

    •transverse plain (width of the cell)

    •May produce streptobacillus

    •Some species (Corynebacterium) sometimes produce palisades arrangement with cells parallel to one another or snapping into a “V” shape

  • A coccus that divides on random planes of division (front to back, top to bottom, left to right…) will likely produce

    a)Staphylococcus

  • Bacterial Size Coccus, Bacillus, Spirillum

    •Coccus 1-2 μM

    •Bacillus 2-20 μM

    •Spirillum10-200 μM

  • classification

    Domain

    kingdom

    phylum

    class

    order

    family

    genus

    species

  • •Bergey’s manual of Systematic Bacteriology & Medical Microbiology System

    •Bergey’s manual of Systematic Bacteriology

    •Everything you ever wanted to know (and a lot you didn’t)

    Medical Microbiology System (Not really a system)

    •Deals only with agents of human disease

    •Classifies bacteria phenotypically, using  common laboratory tests

    •Much easier to use….