Bacterial morphology

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16 Terms

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Coccus

A spherical bacterium

<p>A spherical bacterium</p>
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Bacillus

Rod shaped bacteria

<p>Rod shaped bacteria</p>
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Coccobacillus

Oval bacterium that is intermediate between the coccus and bacillus forms

<p>Oval bacterium that is intermediate between the coccus and bacillus forms</p>
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Diplococcus

A bacterium that occurs as pairs of cocci

<p>A bacterium that occurs as pairs of cocci</p>
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Streptococcus

A bacterium that occurs as chains of cocci

<p>A bacterium that occurs as chains of cocci</p>
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Staphylococcus

A bacterium that occurs as clusters of cocci

<p>A bacterium that occurs as clusters of cocci</p>
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Tetrad

Clusters of four cocci

<p>Clusters of four cocci</p>
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Cell wall

Semi rigid cross linked peptidoglycan (murein) structure outside the cell membrane in most species

- Maintains shape

- Prevents cell lysis by limiting uptake of H2O

<p>Semi rigid cross linked peptidoglycan (murein) structure outside the cell membrane in most species</p><p>- Maintains shape</p><p>- Prevents cell lysis by limiting uptake of H2O</p>
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Gram staining

Gram positive retains violet stain

Gram negative retain pink counter stain

<p>Gram positive retains violet stain</p><p>Gram negative retain pink counter stain</p>
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Gram + bacteria

Cell wall is ~25 layers of peptidoglycan thick

<p>Cell wall is ~25 layers of peptidoglycan thick</p>
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Gram - bacteria

Cell wall is ~2 layers of peptidoglycan thick

<p>Cell wall is ~2 layers of peptidoglycan thick</p>
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Endospores

Dormant stage produced predominantly by Gram + bacteria in stressful environments, resistant to heat and disinfectants, dipicolinic acid stabilizes DNA and keratin coating protects -- produced by Bacillus anthracis and Clostridium tetani

<p>Dormant stage produced predominantly by Gram + bacteria in stressful environments, resistant to heat and disinfectants, dipicolinic acid stabilizes DNA and keratin coating protects -- produced by Bacillus anthracis and Clostridium tetani</p>
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Spirilla

Corkscrew shape bacteria

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Bacilli

Rod-shaped bacteria

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Vibrio

Comma shaped bacteria

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Spirochaetes

Spiral shaped bacteria