Consist of delicate stands of proteins long thin

Info icon This preview shows pages 22–27. Sign up to view the full content.

View Full Document Right Arrow Icon
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
Image of page 22

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
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
Image of page 23
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 Neisseria 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: Neisseria photo , Textbook of Bacteriology, Gram stain of Neisseria gonorrhoeae, Souce PHIL #3798 From the Virtual Microbiology Classroom on ScienceProfOnline.com Virtual Microbiology Classroom on
Image of page 24

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
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
Image of page 25
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).
Image of page 26

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 27
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern