Keith King: Chapter 4

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ninth edition TORTORA

FUNKE

CASE

M I C R O B I O L O G Y a n i n t r o d u c t i o n

4

Part A

Functional

Anatomy of

Prokaryotic and

Eukaryotic Cells

PowerPoint ® Lecture Slide Presentation prepared by Christine L. Case

Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings

Prokaryotic Cells

 Comparing prokaryotic and eukaryotic cells

 Prokaryote comes from the Greek words for prenucleus.

 Eukaryote comes from the Greek words for true nucleus.

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Prokaryote Eukaryote

 One circular chromosome, not in a membrane

 No histones

 No organelles

 Peptidoglycan cell walls

 Binary fission

 Paired chromosomes, in nuclear membrane

 Histones

 Organelles

 Polysaccharide cell walls

 Mitotic spindle

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Morphology

 Coccus ( pleural cocci means berries) are spherical shaped.

 Bacillus (pleural bacilli , meaning little staffs) are rod shaped.

 Coccobacilli are oval shaped rods that look very much like cocci.

 Spirilla have a helical shape, like a corkscrew, and fairly rigid bodies.

 Spirochetes are more tightly spiraled and are more flexible

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 Average size: 0.2 1.0 µm 

2 8 µm

 Basic shapes:

Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings

Figures 4.1a, 4.2a, 4.2d, 4.4b, 4.4c

Arrangements

 Pairs: Diplo cocci, diplo bacilli

 Clusters: Staphylo cocci

 Chains: Strepto cocci, strepto bacilli

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Figures 4.1a, 4.1d, 4.2c

Flagella

 Outside cell wall

 Made of chains of flagellin

 Anchored to the wall and membrane

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Figure 4.8a

Flagella Arrangement

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Figure 4.7

Endospores

 Resting cells

 Resistant to desiccation, heat, chemicals

 Bacillus, Clostridium

 Sporulation: Endospore formation

 Germination: Return to vegetative state

Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings

Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings

Figure 4.21b

Homework

 Review: 1, 2, 3, 5

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