26 Questions
Which of the following is a major difference between Pili and Fimbriae?
Pili are longer and thicker than Fimbriae
How many Pili are generally found per bacterial cell?
1-10
Which bacteria uses its Fimbriae to attach to the intestine and then produces a toxin that causes diarrhea?
Shigella dysenteriae
What governs the formation of Pili?
Plasmid genes
In which type of bacteria are Fimbriae found?
Both in gram negative and gram positive bacteria
What is the main function of Fimbriae?
Attachment of bacterial cell to host
What is the first obligatory step for infection according to the given text?
Attachment
Which bacteria is not part of the Gram +ve Vaginal Flora mentioned in the text?
Bacteroides
Which structure of spore protects the spore with keratine-like protein?
Coat
Based on pathogenicity, which staphylococci is a common pathogen according to the text?
S. aureus
What is the mode of transmission for Staphylococcus aureus mentioned in the text?
Inhalation of air borne droplets
Which disease is not produced by Staphylococcus aureus according to the given text?
Meningitis
What is the main function of peptidoglycan in bacterial cells?
Replication and survival in hostile conditions
Which component is a major surface antigen of gram-positive species and is important in bacterial serotyping?
Teichoic acid
What distinguishes the cell wall of gram-negative bacteria from that of gram-positive bacteria?
It is more complex
What is the backbone of peptidoglycan composed of?
N-acetylglucosamine & N-acetylmuramic acid
Which component of the cell wall constitutes a major surface antigen of gram-positive species and promotes attachment to other bacteria?
Teichoic acid
What is the function of lipoteichoic acid in gram-positive bacteria?
Promote attachment to other bacteria as well as to specific receptors on mammalian cell surfaces
Which structure provides a permeability barrier to large and hydrophobic molecules in Gram-negative bacteria?
Outer membrane
What is the function of Lipopolysaccharide (LPS) in Gram-negative bacteria?
Induce innate immune response
Which external structure is important for survival in the host, despite being unnecessary for the growth of bacteria?
Capsules
What is the primary function of flagella in bacteria?
Provide motility for bacteria
Which type of flagella arrangement is characterized by a tuft of polar flagella at one pole of the bacteria?
Lophotrichous
What is the main function of Pili and fimbriae in bacteria?
Adhesion to surfaces
Which component of the Gram-negative bacterial structure is unique and forms an 'asymmetric bilayer' structure?
Outer membrane
'Ropelike propeller's composed of helically coiled protein subunits (flagellin)' describes which bacterial structure?
Flagella
Discover the key disparities between pili and fimbriae in bacteria. Learn about their structural composition, distribution, function, and significance in bacterial physiology and pathogenesis.
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