Consist of delicate stands of proteins long thin

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Consist of delicate stands of proteins . ___________: Long, thin extensions that allow some bacteria to move about freely in aqueous environments. ____________ (endoflagella): Wind around bacteria, causing movement in waves. Images: Helicobacter pylori ; Axial filament, Source unknown From the Virtual Microbiology Classroom on ScienceProfOnline.com
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Prokaryotes – Surface Appendages ____________ : Most Gram- negative bacteria have these short, fine appendages surrounding the cell. Gram+ bacteria don’t have. No role in motility. Help bacteria adhere to solid surfaces. Major factor in virulence. ____________ : Tubes that are longer than fimbriae, usually shorter than flagella. Use for movement, like grappling hooks, and also use conjugation pili (singular = pilus) to transfer plasmids. Images: E. coli fimbriae , Manu Forero; Bacterial conjugation , Adenosine From the Virtual Microbiology Classroom on ScienceProfOnline.com
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Meet the Microbe! Neisseria and its Fimbiriae Gram- diplococci, resemble coffee beans when viewed microscopically. Neisseria gonorrhoeae causes sexually transmitted disease gonorrhoeae. Antibiotics applied to the eyes of neonates as a preventive measure against gonorrhoea. One of the most communicable disease in the U.S. 125 cases per 100,000. Teens 15-19 yo 634 cases per 100,000. Young adults 20- 25 460 per 100,000. N. meningitidis most common causes of bacterial meningitis in young adults. What Makes Neisseria So Tough? __________________ (LPS) of the cell wall of acts as an endotoxin. Polysaccharide _________ prevents host phagocytosis and aids in evasion of the host immune response. Use __________ to attach onto host cells, avirulent without. Fimbriae have adhesion proteins (adhesins) on their tips that match, lock and key, with proteins on host epithelial cell surface. Image: photo , Textbook of Bacteriology, Gram stain of Neisseria gonorrhoeae, Souce PHIL #3798 From the Virtual Microbiology Classroom on ScienceProfOnline.com Virtual Microbiology Classroom on
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Prokaryotes Cell Shapes Most bacteria are classifies according to shape: 1. __________ (pl. bacilli) = rod-shaped 2. __________ (pl. cocci … sounds like cox-eye ) = spherical 3. Spiral Shaped a. ________ (pl. spirilla) = spiral with rigid cell wall, flagella b. ____________ (pl. spirochetes) = spiral with flexible cell wall, axial filament There are many more shapes beyond these basic ones. A few examples: Coccobacilli = elongated coccal form Filamentous = bacilli that occur in long threads Vibrios = short, slightly curved rods Fusiform = bacilli with tapered ends Images: Basic bacterial shapes, Mariana Ruiz, Other examples of bacterial shapes, FDA, Gov. From the Virtual Microbiology Classroom on ScienceProfOnline.com
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Prokaryotes Arrangements of Cells Bacteria sometimes occur in groups, rather than singly. _________ divide along a single axis, seen in pairs or chains. _________ divide on one or more planes, producing cells in: - pairs (diplococci) - chains (streptococci) - packets (sarcinae) - clusters (staphylococci).
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Consist of delicate stands of proteins Long thin extensions...

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