09-29-06 (11) Cells 2 - Cell Structure: Prokaryotic cell...

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Unformatted text preview: Cell Structure: Prokaryotic cell vs. Eukaryotic cell Size difference Nucleus Membrane-bound organelles Prokaryotic Cells Do not contain a nucleus Do not contain membrane-bound organelles Prokaryotic Cell Prokaryotic Cell Shape Spheres (cocci) Rods (bacilli) Spirals Prokaryotic Cell Shape 1 m 2 m 5 m (a) Spherical (cocci) (b) Rod-shaped (bacilli) (c) Spiral Prokaryotic Characteristics Cell surface structures Motility Internal and genomic organization Reproduction Cell shape Cell Surface Structures Cell wall Capsule Appendages Cell Wall Peptidoglycan layer Cell wall Plasma membrane Protein Gram- positive bacteria 20 m Outer membrane Peptidoglycan layer Plasma membrane Cell wall Lipopolysaccharide Protein Gram- negative bacteria Capsule 200 nm Capsule Fimbriae 200 nm Fimbriae Motility About 50% of prokaryotes are capable of directional movement Taxis Flagella Prokaryotic Flagella Flagellum Filament Hook Cell wall Plasma membrane Basal apparatus 50 nm Internal and Genomic Organization Lack complex compartmentalization Specialized membranes Perform metabolic functions Genome structure Much less DNA than eukaryotic genomes Circular chromosome Specialized Membranes (a) Aerobic prokaryote (b) Photosynthetic prokaryote 0.2 m 1 m Respiratory membrane Thylakoid membranes Prokaryotic Genome 1 m Chromosome Reproduction and Adaptation Reproduce very quickly Limited by environmental factors Endospores Endospores Endospore 0.3 m Eukaryotic Cells True Nucleus Organelles Plasma membrane Cytoplasm Ribosomes Two main types Animal cells Plant cells Animal Cell Plant Cell...
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This note was uploaded on 04/02/2008 for the course BIO 311C taught by Professor Satasivian during the Spring '08 term at University of Texas at Austin.

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09-29-06 (11) Cells 2 - Cell Structure: Prokaryotic cell...

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