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Microbiology: Staphylococcus and Selective Media Quiz

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Microbiology: Staphylococcus and Selective Media Quiz

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Questions and Answers

What is the purpose of Mannitol Salt Agar (MSA)?

To select for members of the genus Staphylococcus (correct)

To prevent the growth of any bacteria

To encourage the growth of all bacteria equally

To solely inhibit the growth of Staphylococcus aureus

Why is Staphylococcus considered facultatively anaerobic?

Because it cannot survive in the presence of oxygen

Because it can survive in both the presence and absence of oxygen (correct)

Because it prefers anaerobic conditions

Because it can only survive in the presence of oxygen

What causes the phenol red in Mannitol Salt Agar to turn yellow?

The high salt concentration

The fermentation of mannitol producing an acidic byproduct (correct)

The addition of Staphylococcus aureus

The presence of gram-negative bacteria

What type of hemolysis is typical for Staphylococcus?

Beta hemolysis (A) Signup and view all the answers

Which type of bacteria does Mannitol Salt Agar primarily select for?

Staphylococcus species (D) Signup and view all the answers

Which type of streptococci breaks down red blood cells and hemoglobin completely?

Beta-hemolytic (B) Signup and view all the answers

What causes the greenish color in alpha hemolysis on blood agar?

Biliverdin (A) Signup and view all the answers

Which characteristic helps classify streptococci into three groups based on hemolysis on blood agar?

Colony morphology (C) Signup and view all the answers

What is the distinguishing feature of gamma-hemolytic streptococci on blood agar?

No hemolysis (B) Signup and view all the answers

Which type of streptococci perform better in an anaerobic environment due to their hemolysins?

Obligate anaerobes (D) Signup and view all the answers