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Which of the following is not a characteristic of the ...

Which of the following is not a characteristic of the Enterobacteriaceae?

Group of answer choices

Gram-positive rods

Gram-negative rods

Oxidase negative

Catalase positive

Produce acid from glucose

 

 

 

None of the enteric bacteria are human pathogens.

Group of answer choices

True

False

 

 

Media that inhibit the growth of some organisms while encouraging others' growth are referred to as _______ media.

 

Group of answer choices

selective

differential

complex

defined

 

 

 

 

Media that contain indicators to expose differences between organisms are referred to as ______ media.

Group of answer choices

selective

differential

complex

defined

 

 

Which of the following is TRUE of EMB agar?

Choose ALL that apply.

Group of answer choices

It contains lactose

It is selective for Gram-positive microorganisms.

It can differentiate between lactose fermenters from nonfermenters.

It inhibits the growth of Gram-negative bacteria.

It contains mannitol

 

 

 

Which of the following is TRUE regarding Mannitol salt agar? 

Choose ALL that apply. 

Group of answer choices

It contains mannitol

It contains lactose

It contains a high concentration of sodium chloride.

It inhibits the growth of organisms that are not in the genus Staphylococcus. 

It can be used to identify Staphylococcus aureus specifically.

It selects for the growth of Gram-negative bacteria.

 

 

 

You inoculate an EMB agar plate with an unknown organism. After incubation, you note while the organism has grown, the growth is colorless. What is your interpretation?

Group of answer choices

The organism does not ferment lactose.

The organism is inhibited by crystal violet and/or bile.

The organism produces acid from the fermentation of lactose.

 

 

You inoculate a Mannitol salt agar plate with an unknown organism. After incubation, you note that the organism has grown well with yellow colonies in color and contains a halo around them. Which option below best represents the type of bacteria growing on the plate?

 

Group of answer choices

Organism inoculated is likely Gram-negative.

Organism inoculated is some type of Staphylococcus but is not Staphylococcus aureus.

Organism inoculated is likely Staphylococcus aureus because there has been fermentation of mannitol.

Organism inoculated is likely Staphylococcus aureus because there has NOT been fermentation of mannitol.

 

 

_____ plating is a commonly used technique for isolating individual species in the microbiology lab.

Group of answer choices

selective

heat

differential

streak

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