Bacteria By Gram Stain Grouping
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Which of the following are Gram Positive Cocci (MARK ALL THAT APPLY)
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Staphylococcus
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Neisseria
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Peptococcus
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Veillonella
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Actinomyces
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Micrococcus
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Gram Straining is a method of staining used to distinguish and classify bacterial species into two large groups, which are negative or positive. Do you believe you can classify bacteria into their correct groups? If you said yes the take up the test below to prove it. All the best!
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- 2.
Which of the following are Gram Negative Cocci (MARK ALL THAT APPLY)
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Acinetobacter
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Branhamella
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Kingella
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Moraxella
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Neisseria
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Veillonella
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Actinomyces
Correct Answer(s)
A. Acinetobacter
A. Branhamella
A. Kingella
A. Moraxella
A. Neisseria
A. VeillonellaExplanation
The correct answer is Acinetobacter, Branhamella, Kingella, Moraxella, Neisseria, Veillonella. Gram-negative cocci are a group of bacteria that have a spherical shape and stain pink or red in the Gram stain test. Acinetobacter, Branhamella, Kingella, Moraxella, Neisseria, and Veillonella are all examples of Gram-negative cocci. Actinomyces, on the other hand, is a Gram-positive bacteria that forms long, branching filaments. Therefore, it is not a Gram-negative cocci.Rate this question:
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- 3.
Which of the following are Gram Negative Rods (MARK ALL THAT APPLY)
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Actinomyces
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Corynebacterium
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Erysipelothrix
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Escherichia
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Klebsiella
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Salmonella
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Shigella
Correct Answer(s)
A. Escherichia
A. Klebsiella
A. Salmonella
A. ShigellaExplanation
The correct answer is Escherichia, Klebsiella, Salmonella, and Shigella. Gram Negative Rods are a group of bacteria that have a specific cell wall structure which stains pink or red in the Gram stain test. Actinomyces and Corynebacterium are Gram Positive Rods, while Erysipelothrix is a Gram Positive Cocci. Therefore, they are not Gram Negative Rods.Rate this question:
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- 4.
Stomatococcus is a gram POSITIVE cocci
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True
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False
Correct Answer
A. TrueExplanation
Stomatococcus is a type of bacteria that is classified as gram-positive. Gram-positive bacteria have a thick layer of peptidoglycan in their cell walls, which retains the crystal violet stain during the Gram staining process. This staining property allows them to appear purple under a microscope. Therefore, the statement that Stomatococcus is a gram-positive cocci is correct.Rate this question:
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- 5.
Planococcus is a gram POSITIVE cocci
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True
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False
Correct Answer
A. TrueExplanation
Planococcus is a type of bacteria that belongs to the group of gram-positive cocci. Gram-positive bacteria have a thick peptidoglycan layer in their cell wall, which retains the crystal violet stain during the Gram staining process, causing them to appear purple under a microscope. This characteristic distinguishes them from gram-negative bacteria, which have a thinner peptidoglycan layer and appear pink after staining. Therefore, the statement "Planococcus is a gram POSITIVE cocci" is true.Rate this question:
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- 6.
Citrobacter is a gram POSITIVE cocci
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True
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False
Correct Answer
A. FalseExplanation
Citrobacter is a gram NEGATIVE RODRate this question:
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- 7.
Which ONE of the following is a Gram POSITIVE rod
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Peptococcus
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Actinomyces
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Gemella
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Staphylococcus
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Ruminococcus
Correct Answer
A. ActinomycesExplanation
All are GRAM POSITIVE COCCI except ActinomycesRate this question:
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- 8.
Actinobacillus, Capnocytophaga, Cardiobacterium, and Haemophilus are all gram POSITIVE rods
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True
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False
Correct Answer
A. FalseExplanation
All of these are GRAM NEGATIVE RODSRate this question:
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- 9.
Gardnerella and Pasteurella are both gram NEGATIVE rods
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True
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False
Correct Answer
A. TrueExplanation
Gardnerella and Pasteurella are both classified as gram-negative rods because they both have a cell wall structure that does not retain the crystal violet stain during the Gram staining process. This means that their cell walls have a thinner layer of peptidoglycan, which is characteristic of gram-negative bacteria. Therefore, the statement that Gardnerella and Pasteurella are both gram-negative rods is true.Rate this question:
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- 10.
Bacillus, Listeria, and Norcardia are all gram ____________
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Negative rods
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Positive rods
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Negative cocci
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Positive cocci
Correct Answer
A. Positive rodsExplanation
Bacillus, Listeria, and Norcardia are all examples of bacteria that belong to the group of gram-positive rods. Gram-positive bacteria have a thick peptidoglycan layer in their cell wall, which retains the crystal violet stain during the Gram staining process. These bacteria appear purple under the microscope. Rod-shaped bacteria are called rods or bacilli, while cocci are spherical-shaped bacteria. Therefore, the correct answer is positive rods.Rate this question:
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- 11.
Actinomyces Corynebacterium Erysipelothrix are all gram ______________
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Negative rods
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Positive rods
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Negative cocci
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Positive cocci
Correct Answer
A. Positive rodsExplanation
Actinomyces, Corynebacterium, and Erysipelothrix are all gram-positive rods. This means that they are bacteria that have a thick layer of peptidoglycan in their cell walls, which retains the crystal violet stain used in the Gram staining technique. The term "rods" refers to their shape, as they appear elongated and cylindrical under a microscope.Rate this question:
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- 12.
Serratia Aeromonas Morganella Proteus Legionella Eikenella are all gram ____________________
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Negative rods
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Positive rods
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Negative cocci
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Positive cocci
Correct Answer
A. Negative rodsExplanation
The given organisms, Serratia, Aeromonas, Morganella, Proteus, Legionella, and Eikenella, are all classified as gram-negative rods. This means that they have a cell wall structure that stains pink/red in the Gram staining procedure, indicating that they do not retain the crystal violet stain. Gram-negative rods are a diverse group of bacteria that can cause a wide range of infections in humans and animals.Rate this question:
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- 13.
Francisella, Brucella, and Bordatella are all gram _________________
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Negative rods
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Positive rods
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Negative cocobacili
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Positive cocobacili
Correct Answer
A. Negative cocobaciliExplanation
Francisella, Brucella, and Bordatella are all gram-negative rods. This means that they are bacteria that have a cell wall that does not retain the crystal violet stain in the Gram staining method, and they have a rod-shaped morphology. The term "cocobacili" refers to bacteria that have a shape between a coccus (spherical) and a bacillus (rod-shaped), which does not accurately describe these bacteria. Therefore, the correct answer is "negative cocobacili."Rate this question:
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- 14.
Bartonella, Bacterioides, Bilophilia, and Borrelia are all gram NEGATIVE rods
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True
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False
Correct Answer
A. TrueExplanation
The statement is true because all the mentioned bacteria, Bartonella, Bacterioides, Bilophilia, and Borrelia, are gram-negative rods. Gram-negative bacteria have a thin peptidoglycan layer in their cell wall and do not retain the crystal violet stain in the Gram staining method. This characteristic is different from gram-positive bacteria, which have a thick peptidoglycan layer and retain the stain.Rate this question:
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- 15.
Citrobacter, Cedecea, Campylobacter, Capnocytophaga, Cardiobacterium, and Chrombacterium are all gram NEGATIVE rods
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True
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False
Correct Answer
A. TrueExplanation
The statement is true because all the mentioned bacteria (Citrobacter, Cedecea, Campylobacter, Capnocytophaga, Cardiobacterium, and Chrombacterium) are gram-negative rods. Gram-negative bacteria have a thinner peptidoglycan layer in their cell wall, which allows the crystal violet stain to be washed out during the Gram staining process, resulting in a red or pink color when counterstained with safranin.Rate this question:
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- 16.
Actinomyces is gram positive rods
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True
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False
Correct Answer
A. TrueExplanation
Actinomyces is a type of bacteria that is classified as gram-positive rods. Gram-positive bacteria retain the crystal violet stain used in the Gram staining method, indicating a thick peptidoglycan layer in their cell walls. Actinomyces is known for its filamentous appearance and is commonly found in soil and the oral cavity of humans. Its gram-positive nature is an important characteristic for identification and classification purposes. Therefore, the given statement that Actinomyces is gram positive rods is true.Rate this question:
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- 17.
Corynebacterium is gram negative rods
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True
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False
Correct Answer
A. FalseExplanation
it is a gram POSITIVE rodsRate this question:
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- 18.
Which of the following are RODS (MARK ALL THAT APPLY)
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Gemella
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Veillonella
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Kingella
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Hafnia
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Vibrio
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Norcardia
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Spirillum-coiled
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Treponema
Correct Answer(s)
A. Hafnia
A. Vibrio
A. Norcardia
A. Spirillum-coiled
A. Treponema -
- 19.
Which of the following are cocci (MARK ALL THAT APPLY)
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Neisseria
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Moraxella
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Veillonella
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Ruminococcus
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Gemella
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Lactobacillus
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Gardnerella
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Proteus
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Plesiomonas
Correct Answer(s)
A. Neisseria
A. Moraxella
A. Veillonella
A. Ruminococcus
A. GemellaExplanation
The given question asks to identify the cocci among the listed options. Cocci are spherical or round-shaped bacteria. Neisseria, Moraxella, Veillonella, Gemella, and Lactobacillus are all cocci. Ruminococcus, Gardnerella, Proteus, and Plesiomonas are not cocci as they are either rod-shaped or spiral-shaped bacteria.Rate this question:
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- 20.
The bacteria that end in -coccus PLUS Gemella are all gram positive cocci
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True
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False
Correct Answer
A. TrueExplanation
The statement is true because bacteria that end in -coccus, such as Staphylococcus and Streptococcus, are gram-positive cocci. Gemella is also a genus of bacteria that falls into this category. Gram-positive cocci bacteria have a thick peptidoglycan layer in their cell walls, which retains the crystal violet stain during the Gram staining process, causing them to appear purple under a microscope.Rate this question:
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- 21.
All of the bacteria that end in -ella are ALL gram NEGATIVE
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True
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False
Correct Answer
A. TrueExplanation
Some are rods, cocobacili, and cocci but they ARE all gram negativeRate this question:
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- 22.
Clostridium and Actinomyces are gram POSITIVE rods
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True
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False
Correct Answer
A. TrueExplanation
Clostridium and Actinomyces are both types of bacteria that are classified as gram-positive rods. Gram-positive bacteria have a thick peptidoglycan layer in their cell walls, which retains the crystal violet stain during the Gram staining process, causing them to appear purple under a microscope. Clostridium and Actinomyces are examples of gram-positive rods, meaning they are rod-shaped bacteria that retain the purple stain. Therefore, the statement "Clostridium and Actinomyces are gram POSITIVE rods" is true.Rate this question:
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- 23.
Which of the following are gram POSITIVE rods (MARK ALL THAT APPLY)
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Clostridium
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Actinomyces
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Bifidobacterium
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Fusobacterium
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Lactobacillus
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Helicobacter
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Propionibacterium
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Treponema
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Eubacterium
Correct Answer(s)
A. Clostridium
A. Actinomyces
A. Bifidobacterium
A. Lactobacillus
A. Propionibacterium
A. EubacteriumExplanation
Gram-positive rods are bacteria that retain the crystal violet stain and appear purple under a microscope after the Gram staining procedure. Clostridium, Actinomyces, Bifidobacterium, Lactobacillus, Propionibacterium, and Eubacterium are all examples of gram-positive rods. These bacteria have a thick peptidoglycan layer in their cell wall, which allows them to retain the crystal violet stain. Fusobacterium, Helicobacter, and Treponema, on the other hand, are gram-negative bacteria and do not retain the crystal violet stain.Rate this question:
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Current Version
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Jan 18, 2023Quiz Edited by
ProProfs Editorial Team -
Apr 25, 2011Quiz Created by
KimmieG
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