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Shown is a MacConkey agar plate. Describe the Gram reaction and lactose fermentation of the two different bacteria shown.
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Ch. 20 - Pathogenic Gram-Negative Cocci and Bacilli
Bauman6th EditionMicrobiology with Diseases by TaxonomyISBN: 9780134832302
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TOC.tableOfContents
- Ch. 1 - A Brief History of Microbiology31
- Ch. 2 - The Chemistry of Microbiology28
- Ch. 3 - Cell Structure and Function39
- Ch. 4 - Microscopy, Staining, and Classification25
- Ch. 5 - Microbial Metabolism51
- Ch. 6 - Microbial Nutrition and Growth37
- Ch. 7 - Microbial Genetics51
- Ch. 8 - Recombinant DNA Technology21
- Ch. 9 - Controlling Microbial Growth in the Environment36
- Ch. 10 - Controlling Microbial Growth in the Body: Antimicrobial Drugs21
- Ch. 11 - Characterizing and Classifying Prokaryotes29
- Ch. 12 - Characterizing and Classifying Eukaryotes34
- Ch. 13 - Characterizing and Classifying Viruses, Viroids, and Prions23
- Ch. 14 - Infection, Infectious Diseases, and Epidemiology35
- Ch. 15 - Innate Immunity34
- Ch. 16 - Adaptive Immunity21
- Ch. 17 - Immunization and Immune Testing29
- Ch. 18 - Immune Disorders22
- Ch. 19 - Pathogenic Gram-Positive Bacteria25
- Ch. 20 - Pathogenic Gram-Negative Cocci and Bacilli28
- Ch. 21 - Rickettsias, Chlamydias, Spirochetes, and Vibrios25
- Ch. 22 - Pathogenic Fungi47
- Ch. 23 - Parasitic Protozoa, Helminths, and Arthropod Vectors44
- Ch. 24 - Pathogenic DNA Viruses23
- Ch. 25 - Pathogenic RNA Viruses30
- Ch. 26 - Applied and Industrial Microbiology29
- Ch. 27 - Microbial Ecology and Microbiomes22
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Bauman 6th EditionCh. 20 - Pathogenic Gram-Negative Cocci and BacilliProblema 3
Bauman 6th EditionCh. 20 - Pathogenic Gram-Negative Cocci and BacilliProblema 3Capitolo 20, Problema 3
Which of the following bacterial cells is most likely to be virulent?
a. A cell with fimbriae and LOS
b. A cell with a polysaccharide capsule and lipooligosaccharide
c. A cell with fimbriae, lipooligosaccharide, and a polysaccharide capsule
d. A cell with fimbriae but no capsule
Guida verificata passo dopo passo1
Step 1: Understand the key virulence factors mentioned in the options: fimbriae, lipooligosaccharide (LOS), and polysaccharide capsule. Each of these contributes differently to bacterial pathogenicity.
Step 2: Recall that fimbriae help bacteria adhere to host cells, which is important for colonization but alone may not confer high virulence.
Step 3: Recognize that lipooligosaccharide (LOS) is an endotoxin found in the outer membrane of some Gram-negative bacteria, contributing to immune evasion and inflammation.
Step 4: Know that a polysaccharide capsule protects bacteria from phagocytosis by host immune cells, significantly enhancing virulence.
Step 5: Compare the options by combining these factors: the most virulent bacterial cell is likely the one possessing fimbriae (for adhesion), LOS (for immune interaction), and a polysaccharide capsule (for protection), which corresponds to option c.
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Virulence Factors in Bacteria
Virulence factors are molecules produced by bacteria that enhance their ability to cause disease. These include structures like fimbriae for attachment, capsules for evading immune responses, and components like lipooligosaccharide that trigger inflammation. Understanding these factors helps determine which bacterial cells are more likely to be virulent.
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03:05
Virulence
Polysaccharide Capsule
A polysaccharide capsule is a protective layer surrounding some bacterial cells that helps them evade phagocytosis by host immune cells. This capsule increases bacterial survival in the host and is often associated with increased virulence, making bacteria more resistant to immune defenses.
Video consigliato:
01:53Capsules vs. Slime Layers
Lipooligosaccharide (LOS)
Lipooligosaccharide is a component of the outer membrane of certain Gram-negative bacteria, similar to lipopolysaccharide but with a shorter polysaccharide chain. LOS can trigger strong immune responses and contribute to bacterial pathogenicity by inducing inflammation and damaging host tissues.
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