Bacteria By Gram Stain Grouping

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| By KimmieG
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  • 1/23 Questions

    Clostridium and Actinomyces are gram POSITIVE rods

    • True
    • False
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About This Quiz

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!

Bacteria By Gram Stain Grouping - Quiz

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  • 2. 

    Citrobacter is a gram POSITIVE cocci

    • True

    • False

    Correct Answer
    A. False
    Explanation
    Citrobacter is a gram NEGATIVE ROD

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  • 3. 

    Actinomyces is gram positive rods

    • True

    • False

    Correct Answer
    A. True
    Explanation
    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.

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  • 4. 

    Stomatococcus is a gram POSITIVE cocci

    • True

    • False

    Correct Answer
    A. True
    Explanation
    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.

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  • 5. 

    Gardnerella and Pasteurella are both gram NEGATIVE rods

    • True

    • False

    Correct Answer
    A. True
    Explanation
    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.

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  • 6. 

    Serratia Aeromonas Morganella Proteus Legionella Eikenella are all gram ____________________

    • Negative rods

    • Positive rods

    • Negative cocci

    • Positive cocci

    Correct Answer
    A. Negative rods
    Explanation
    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.

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  • 7. 

    Planococcus is a gram POSITIVE cocci

    • True

    • False

    Correct Answer
    A. True
    Explanation
    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.

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  • 8. 

    The bacteria that end in -coccus PLUS Gemella are all gram positive cocci

    • True

    • False

    Correct Answer
    A. True
    Explanation
    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.

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  • 9. 

    Citrobacter, Cedecea, Campylobacter, Capnocytophaga, Cardiobacterium, and Chrombacterium are all gram NEGATIVE rods

    • True

    • False

    Correct Answer
    A. True
    Explanation
    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.

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  • 10. 

    Bartonella, Bacterioides, Bilophilia, and Borrelia are all gram NEGATIVE rods

    • True

    • False

    Correct Answer
    A. True
    Explanation
    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.

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  • 11. 

    All of the bacteria that end in -ella are ALL gram NEGATIVE

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Some are rods, cocobacili, and cocci but they ARE all gram negative

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  • 12. 

    Actinomyces Corynebacterium Erysipelothrix are all gram ______________

    • Negative rods

    • Positive rods

    • Negative cocci

    • Positive cocci

    Correct Answer
    A. Positive rods
    Explanation
    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.

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  • 13. 

    Bacillus, Listeria, and Norcardia are all gram ____________ 

    • Negative rods

    • Positive rods

    • Negative cocci

    • Positive cocci

    Correct Answer
    A. Positive rods
    Explanation
    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.

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  • 14. 

    Corynebacterium is gram negative rods

    • True

    • False

    Correct Answer
    A. False
    Explanation
    it is a gram POSITIVE rods

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  • 15. 

    Actinobacillus, Capnocytophaga, Cardiobacterium, and Haemophilus are all gram POSITIVE rods

    • True

    • False

    Correct Answer
    A. False
    Explanation
    All of these are GRAM NEGATIVE RODS

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  • 16. 

    Which ONE of the following is a Gram POSITIVE rod

    • Peptococcus

    • Actinomyces

    • Gemella

    • Staphylococcus

    • Ruminococcus

    Correct Answer
    A. Actinomyces
    Explanation
    All are GRAM POSITIVE COCCI except Actinomyces

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  • 17. 

    Which of the following are Gram Positive Cocci (MARK ALL THAT APPLY)

    • Staphylococcus

    • Neisseria

    • Peptococcus

    • Veillonella

    • Actinomyces

    • Micrococcus

    Correct Answer(s)
    A. Staphylococcus
    A. Peptococcus
    A. Micrococcus
    Explanation
    Staphylococcus, Peptococcus, and Micrococcus are Gram Positive Cocci. Gram positive cocci are spherical bacteria that retain the crystal violet stain in the Gram staining procedure, indicating that they have a thick peptidoglycan layer in their cell wall. Staphylococcus, Peptococcus, and Micrococcus are all examples of Gram positive cocci bacteria. Neisseria, Actinomyces, and Veillonella are not Gram positive cocci, as Neisseria is a Gram negative diplococcus, Actinomyces is a Gram positive rod, and Veillonella is a Gram negative cocci.

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  • 18. 

    Which of the following are Gram Negative Rods (MARK ALL THAT APPLY)

    • Actinomyces

    • Corynebacterium

    • Erysipelothrix

    • Escherichia

    • Klebsiella

    • Salmonella

    • Shigella

    Correct Answer(s)
    A. Escherichia
    A. Klebsiella
    A. Salmonella
    A. Shigella
    Explanation
    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.

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  • 19. 

    Francisella, Brucella, and Bordatella are all gram _________________

    • Negative rods

    • Positive rods

    • Negative cocobacili

    • Positive cocobacili

    Correct Answer
    A. Negative cocobacili
    Explanation
    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."

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  • 20. 

    Which of the following are Gram Negative Cocci (MARK ALL THAT APPLY)

    • Acinetobacter

    • Branhamella

    • Kingella

    • Moraxella

    • Neisseria

    • Veillonella

    • Actinomyces

    Correct Answer(s)
    A. Acinetobacter
    A. Branhamella
    A. Kingella
    A. Moraxella
    A. Neisseria
    A. Veillonella
    Explanation
    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.

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  • 21. 

    Which of the following are cocci (MARK ALL THAT APPLY)

    • Neisseria

    • Moraxella

    • Veillonella

    • Ruminococcus

    • Gemella

    • Lactobacillus

    • Gardnerella

    • Proteus

    • Plesiomonas

    Correct Answer(s)
    A. Neisseria
    A. Moraxella
    A. Veillonella
    A. Ruminococcus
    A. Gemella
    Explanation
    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.

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  • 22. 

    Which of the following are RODS (MARK ALL THAT APPLY)

    • Gemella

    • Veillonella

    • Kingella

    • Hafnia

    • Vibrio

    • Norcardia

    • Spirillum-coiled

    • Treponema

    Correct Answer(s)
    A. Hafnia
    A. Vibrio
    A. Norcardia
    A. Spirillum-coiled
    A. Treponema
  • 23. 

    Which of the following are gram POSITIVE rods (MARK ALL THAT APPLY)

    • Clostridium

    • Actinomyces

    • Bifidobacterium

    • Fusobacterium

    • Lactobacillus

    • Helicobacter

    • Propionibacterium

    • Treponema

    • Eubacterium

    Correct Answer(s)
    A. Clostridium
    A. Actinomyces
    A. Bifidobacterium
    A. Lactobacillus
    A. Propionibacterium
    A. Eubacterium
    Explanation
    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.

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Quiz Review Timeline (Updated): Jan 18, 2023 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Jan 18, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Apr 25, 2011
    Quiz Created by
    KimmieG

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