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Bacterial Cell Shape and Classification

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Questions and Answers

What is the primary factor that determines the shape of a bacterial cell?

Cytoplasm
Nucleus
Cell membrane
Rigid cell wall (correct)

What is the characteristic arrangement of Cocci bacteria in Streptococci?

In spirals
In pairs
In clusters
In chains (correct)

What is the size of Salmonella bacteria?

10-12 X 2.0 μm
2-4 X 0.6 μm (correct)
1-2 X 0.3 μm
5-7 X 1.0 μm

What is the oxygen requirement for the growth of Obligate Anaerobes?

No oxygen (D) Signup and view all the answers

How many serotypes of Salmonella are known to exist?

Exactly 2500 (B) Signup and view all the answers

What is the characteristic motility of most Salmonella serotypes?

Motile with peritrichous flagella (B) Signup and view all the answers

What is the result of a Voges-Proskauer (VP) test for Salmonella?

Negative (C) Signup and view all the answers

What type of anaerobe can grow with or without oxygen?

Facultative Anaerobe (A) Signup and view all the answers

What is a characteristic of Cocci bacteria in Staphylococci?

They are arranged in clusters (B) Signup and view all the answers

What is the oxygen requirement for the growth of Facultative Anaerobes?

They can grow with or without oxygen (D) Signup and view all the answers

What is a characteristic of Spirochetes bacteria?

They are spiral-shaped (A) Signup and view all the answers

Which of the following is a characteristic of Obligate Aerobes?

They cannot ferment or respire anaerobically (B) Signup and view all the answers

What is the result of a catalase test for Salmonella?

Positive (A) Signup and view all the answers

What is the characteristic arrangement of Cocci bacteria in Pneumococci?

In pairs (C) Signup and view all the answers

What is the characteristic of Microaerophiles regarding oxygen?

They require low levels of oxygen (C) Signup and view all the answers

What is a characteristic of Salmonella regarding lactose fermentation?

They do not ferment lactose (D) Signup and view all the answers

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