MCPHS Microbiology Self Paced Questions and Answers Latest 2024/2025 with complete solutions
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Course
MCPHS Microbiology Self Paced
Institution
MCPHS Microbiology Self Paced
Which of these conditions would NOT affect the ability of Streptococcus mutans to attach to teeth? -
The absence of Actinomyces, a bacterium that can be part of dental plaque
cell wall components - M proteins: mediates attachment and resists phagocytosis (strep.
pyogenes)
Opa protein: assist at...
MCPHS Microbiology Self Paced
Which of these conditions would NOT affect the ability of Streptococcus mutans to attach to teeth? -
The absence of Actinomyces, a bacterium that can be part of dental plaque
cell wall components - M proteins: mediates attachment and resists phagocytosis (strep.
pyogenes)
Opa protein: assist attachment and recept mediated endocytosis, inhibs helper t cells (n. gonorrhoeae)
Invasins: Penetration into the host cell cytoskeleton - Salmonella alters host actin to enter a host
cell
Listeria uses actin to move from one cell to the next
Direct damage caused by - disrupting the host cells function
produces waste products
toxins
induce hypersensitive reactions
damage immediate vicinity
use hosts nutrients (iron) -siderophores
Siderophores - proteins that free host stores of iron
Toxin - substance that contributes to pathogenicity
Toxoid - inactivated toxin used in a vaccine
Antitoxin - antibodies against a specific toxin
, Endotoxins - the lipid portions of lipopolysaccharides (LPS) that are part of the outer membrane
of the cell wall of gram-negative bacteria. The endotoxins are liberated when the bacteria die and the
cell wall breaks apart.
PART OF BACTERIAL CELL NOT A PRODUCT
Lipid NOT proteins
all produce same SS
Exotoxins - specific for a structure or function in host cell
Can be gram pos or neg
Are proteins, enzymes
secreted into medium during log phase
most lethal
produce SS
Classification of exotoxins - 1. Based on host cell attacked (cardiotoxin)
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