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Questions and Answers
Which organism appears purple due to being gram positive?
Which organism appears purple due to being gram positive?
- Clostridium tetani (correct)
- Mycobacterium smegmatis
- Escherichia coli
- Neisseria sicca
What is the shape and arrangement of Micrococcus luteus?
What is the shape and arrangement of Micrococcus luteus?
- Coccus in chains
- Bacillus in singles
- Bacillus in clusters
- Coccus in tetrads (correct)
Which of the following organisms is classified as bacillus and is gram negative?
Which of the following organisms is classified as bacillus and is gram negative?
- Serratia marcescens
- Escherichia coli (correct)
- Micrococcus luteus
- Bacillus megaterium
How can Mycobacterium smegmatis be characterized under gram staining?
How can Mycobacterium smegmatis be characterized under gram staining?
What is the arrangement of Bacillus megaterium?
What is the arrangement of Bacillus megaterium?
Which organism is acid fast due to the presence of mycolic acids?
Which organism is acid fast due to the presence of mycolic acids?
What color will Bacillus megaterium appear in gram staining?
What color will Bacillus megaterium appear in gram staining?
Which of the following is false about Escherichia coli?
Which of the following is false about Escherichia coli?
Match the following bacteria with their shapes:
Match the following bacteria with their shapes:
Match the following bacteria with their gram staining results:
Match the following bacteria with their gram staining results:
Match the following bacteria with their arrangements:
Match the following bacteria with their arrangements:
Match the following bacteria with their endospore formation status:
Match the following bacteria with their endospore formation status:
Match the following bacteria with their acid-fast character:
Match the following bacteria with their acid-fast character:
Match the following bacteria with their associated colors in gram staining:
Match the following bacteria with their associated colors in gram staining:
Match the following bacteria with their cluster types or arrangements:
Match the following bacteria with their cluster types or arrangements:
Match the following bacteria with their primary shapes:
Match the following bacteria with their primary shapes:
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Study Notes
Staphylococcus aureus
- Shape: Coccus (round)
- Arrangement: Grape-like clusters
- Gram Stain: Positive (purple)
- Endospore Formation: Does not form endospores (pink)
- Acid-Fast: Not acid-fast (blue)
Escherichia coli
- Shape: Bacillus (rod-shaped)
- Arrangement: Single
- Gram Stain: Negative (pink)
- Endospore Formation: Does not form endospores (pink)
- Acid-Fast: Not acid-fast (blue)
Bacillus megaterium
- Shape: Bacillus (rod-shaped)
- Arrangement: Chains or pairs
- Gram Stain: Positive (purple)
- Endospore Formation: Forms endospores (green)
- Acid-Fast: Not acid-fast (blue)
Micrococcus luteus
- Shape: Coccus (round)
- Arrangement: Tetrads (groups of four)
- Gram Stain: Positive (purple)
- Endospore Formation: Does not form endospores (pink)
- Acid-Fast: Not acid-fast (blue)
Mycobacterium smegmatis
- Shape: Single bacilli (rods) arranged in cords
- Gram Stain: Pink due to its high lipid content cell wall (not a true positive or negative result)
- Endospore Formation: Does not form endospores (pink)
- Acid-Fast: Acid-fast (red/pink) due to mycolic acids in its cell wall
Neisseria sicca
- Shape: Diplococci (pairs of cocci)
- Gram Stain: Negative (pink)
- Endospore Formation: Does not form endospores (pink)
- Acid-Fast: Not acid-fast (blue)
Serratia marcescens
- Shape: Single bacilli (rods)
- Gram Stain: Positive (purple)
- Endospore Formation: Does not form endospores (pink)
- Acid-Fast: Not acid-fast (blue)
Clostridium tetani
- Shape: Single bacilli (rods)
- Gram Stain: Positive (purple)
- Endospore Formation: Forms endospores (green)
- Acid-Fast: Not acid-fast (blue)
Staphylococcus aureus
- Coccus shaped bacteria that forms grape-like clusters.
- Gram-positive, meaning it stains purple.
- Does not form endospores, so it will appear pink.
- Not acid-fast, so it stains blue.
Escherichia coli
- Bacillus shaped bacteria that typically appears as single cells.
- Gram-negative, meaning it stains pink.
- Does not form endospores, so it will appear pink.
- Not acid-fast, so it stains blue.
Bacillus megaterium
- Bacillus shaped bacteria that arranges in chains or pairs.
- Gram-positive, meaning it stains purple.
- Forms endospores, so it will appear green.
- Not acid-fast, so it stains blue.
Micrococcus luteus
- Coccus shaped bacteria that forms tetrads, clusters of four.
- Gram-positive, meaning it stains purple.
- Does not form endospores, so it will appear pink.
- Not acid-fast, so it stains blue.
Mycobacterium smegmatis
- Single bacilli that form cords.
- Stains pink due to its high lipid content cell wall.
- Does not form endospores, so it will appear pink.
- Acid-fast, meaning it stains red/pink. This is due to the presence of mycolic acids.
Neisseria sicca
- Diplococci, meaning pairs of coccus-shaped bacteria.
- Gram-negative, meaning it stains pink.
- Does not form endospores, so it will appear pink.
- Not acid-fast, so it stains blue.
Serratia marcescens
- Single bacilli shaped bacteria.
- Gram-negative, meaning it stains pink.
- Does not form endospores, so it will appear pink.
- Not acid-fast, so it stains blue.
Clostridium tetani
- Single bacilli shaped bacteria.
- Gram-positive, meaning it stains purple.
- Forms endospores so it will appear green.
- Not acid-fast, so it stains blue.
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