Gram stain Flashcards

(10 cards)

1
Q

gram staining is an example of which type of staining?

A

differential stain

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2
Q

what is the primary stain used in Gram staining?

A

crystal violet

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3
Q

what is the function of iodine in Gram staining?

A

mordant

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4
Q

which type of bacteria retains the crystal violet stain after alcohol treatment?

A

gram-positive

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5
Q

gram-positive bacteria have a thick layer of which component in their cell wall?

A

peptidoglycan

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6
Q

gram-negative bacteria have an outer membrane rich in which component?

A

Lipopolysaccharide

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7
Q

what color do gram-negative bacteria appear after gram staining?

A

pink

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8
Q

which of the following is a common gram-positive bacterium?
- E. coli
- Lactobacillus
- salmonella
- pseudomonas

A

Lactobacillus

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9
Q

which of the following is a common Gram-negative bacterium?
- Staph. aureus
- Bacillus subtilis
- E. coli
- Clostridium

A

E. Coli

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10
Q

why do gram-negative bacteria lose the crystal violet stain?
- thin peptidoglycan layer
- high lipid content in the outer membrane
- presence of teichoic acids
- both a and b

A

both a and b

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