The Size Shapes And Arrangment Bacteria Flashcards
Q: What is the size range of most bacteria?
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A: 0.2 to 2.0 µm in diameter and 2 to 8 µm in length
Q: What are the three main shapes of bacteria?
A: Spherical-shaped (coccus), rod-shaped (bacillus), and spiral-shaped (لولبية).
Q: What does “coccus” mean, and what is its plural form?
A: Coccus means “berry-shaped,” and the plural is “cocci.”
Q: What does “bacillus” mean, and what is its plural form?
A: Bacillus means “little rods or walking sticks,” and the plural is “bacilli.”
Q: What are cocci, and what shapes can they have?
A: Cocci are usually round but can be oval, elongated, or flattened on one side.
Q: What are diplococci?
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A: Cocci that remain in pairs after dividing
Q: What are streptococci?
A: Cocci that divide and remain attached in chainlike patterns.
Q: What are tetrads?
A: Cocci that divide in two planes and remain in groups of f
Q: What are sarcinae?
A: Cocci that divide in three planes and remain attached in cubelike groups of eight.
Q: What are staphylococci?
A: Cocci that divide in multiple planes and form grapelike clusters or broad sheets.
Q: Why are cocci group characteristics important?
A: They are frequently helpful in identifying certain cocci.
Q: How do bacilli divide, and how does this affect their arrangement?
A: Bacilli divide only across their short axis, leading to fewer groupings than cocci.
Q: What are single bacilli?
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A: Bacilli that appear as single rods
Q: What are diplobacilli?
A: Bacilli that appear in pairs after division.
Q: What are streptobacilli?
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A: Bacilli that form chains
Q: What are coccobacilli?
A: Bacilli that are oval-shaped and resemble cocci.
Q: How do some bacilli differ in shape?
A: Some look like straws, others have tapered ends like cigars.
Q: What is a defining feature of spiral bacteria?
A: They have one or more twists and are never straight.
Q: What are vibrios?
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A: Bacteria that look like curved rods
Q: What are spirilla?
A: Spiral-shaped bacteria with a helical, corkscrew shape and fairly rigid bodies.
Q: What are spirochetes?
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A: Helical, flexible spiral bacteria
Q: How do spirilla and spirochetes differ in movement?
A: Spirilla use propeller-like flagella, while spirochetes move with axial filaments within a flexible sheath.
Q: What unusual shapes can some prokaryotes have?
A: Some prokaryotes can be star-shaped or rectangular.
Q: What determines the shape of a bacterium?
A: The shape is determined by heredity.
