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

검증된 단계별 안내

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.

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.

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.

Which of the following bacterial cells is most likely to be virulent?a. A cell with fimbriae and LOSb. A cell with a polysaccharide capsule and lipooligosaccharidec. A cell with fimbriae, lipooligosaccharide, and a polysaccharide capsuled. A cell with fimbriae but no capsule