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Microbiology > M7 - Caries > Flashcards

M7 - Caries Flashcards

1
Q

What group are oral streptococci apart of?

A

Viridians group

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2
Q

What type of streptococci are found on the tooth surface?

A

strep mutans

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3
Q

Where are strep salivarius found?

A

Tongue

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4
Q

What type of anaerobe are step mutans?

A

falcultative

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5
Q

What makes strep mutans aciduric?

A

Tolerate high concentrations of acid

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6
Q

Extracellular polymeric substances are known as?

A

Glucans

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7
Q

What is the name of the enzyme that establishes glycosidic linkages?

A

Glucotransferase (GTF)

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8
Q

What substance promotes extracellular polymeric substances?

A

Sucrose

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9
Q

Mutans are water soluble/insoluble glucans?

A

Insoluble

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10
Q

Dextrans are water soluble/ insoluble glucans?

A

soluble

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11
Q

What is the name of the enzyme that transfers L-fructose sugar from GDP- fructose?

A

Fructosyltransferase (FTF)

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12
Q

What are the 3 key proteins involved in attachment of S.mutans?

A
  1. protein antigens
  2. GTF
  3. Glucan binding proteins
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13
Q

Are lactobacilli gram +ve or -ve?

A

Gram +ve

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14
Q

What type of anaerobe are lactobacilli?

A

Facultative

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15
Q

After strep, what is the most important group of bacteria involves in caries?

A

Lactobacilli

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16
Q

What is lactobacilli grouped by?

A

fermentation end products

17
Q

Lactobacilli increase as streptococci?

A

decrease

18
Q

What do actinomyces produce?

A

EPS

19
Q

Are actinomyces gram +ve or -ve?

A

Gram +ve

20
Q

What do actinomyces need for optimal growth?

A

C02

21
Q

Are Viellonella gram +ve or -ve?

A

Gram -ve

22
Q

What do Viellonella use as their energy source?

A

lactic acid

23
Q

What strain of viellonella colonises the oral cavity?

A

Viellonella parvula

24
Q

How does Viellonella possible make the community less cariogenic?

A

catabolises lactic acid to weaker acids, raising pH

25
Q

What is the name of the protein that induces metabolic blocks?

A

Bacteriocin

26
Q

Knowing how many microorganisms there are in a vicinity and regulating the expression of genes within the DNA of bacterium is called?

A

Quorum sensing

Microbiology (14 decks)

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