Mannitol Salt Agar

Welcome to MCQ quiz on Mannitol Salt Agar

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Mannitol salt agar is selective for which bacterial genus ?

A) Staphylococcus

B) Streptococcus

C) Escherichia

D) Salmonella

For which bacterial genus does Mannitol Salt Agar (MSA) differentiate between species?

A) Streptococcus

B) Escherichia

C) Salmonella

D) Staphylococcu

why is mannitol salt agar used as a selective medium for normal skin microbiota

A) It contains high salt concentration that inhibits most bacteria except for halophilic organisms

B) It contains mannitol that can be fermented by skin microbiota

C) It contains specific nutrients that promote the growth of skin microbiota

D) It is not used as a selective medium for normal skin microbiota

Why is Mannitol Salt Agar (MSA) used to isolate Staphylococci?

A) It contains specific nutrients that promote the growth of Staphylococci

B) It contains a high concentration of salt that inhibits the growth of most bacteria except for halophilic organisms such as Staphylococci

C) It is a differential medium that can differentiate between different species of Staphylococci

D) It is not used to isolate Staphylococci

What type of media is Mannitol Salt Agar (MSA)?

A) Enrichment media B

) Differential media

C) Selective media

D) Transport media

E) Selective & Differential media

What is the purpose of adding Phenol Red to Mannitol Salt Agar (MSA)?

A) To act as a nutrient for bacterial growth

B) To inhibit the growth of most bacteria except for halophilic organisms

C) To differentiate between different species of Staphylococcus

D) To act as a pH indicator

What is the agent or chemical in Mannitol Salt Agar (MSA) that makes the medium differential?

A) Mannitol

B) Salt

C) Phenol Red

D) All of the above

when a mannitol salt agar plate turns yellow this indicates?

A) The presence of Staphylococcus bacteria

B) The absence of Staphylococcus bacteria

C) The presence of halophilic bacteria

D) The absence of halophilic bacteria

What is the selective ingredient in Mannitol Salt Agar (MSA)?

A) Mannitol

B) Salt

C) Phenol Red

D) Sodium chloride

Why can Mannitol Salt Agar (MSA) is described as both selective and differential media?

A) They are selective for specific bacterial species and differential for the amount of bacterial growth

B) They are selective for specific bacterial species and differential for the type of bacterial metabolism

C) They are selective for specific bacterial species and differential for the pH of the medium

D) They are selective for specific bacterial species and differential for the color of the medium

What are the positive and negative results for Mannitol Salt Agar (MSA)?

A) Positive: yellow; negative: red

B) Positive: red; negative: yellow

C) Positive: growth; negative: no growth

D) Positive: purple; negative: green

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