A culture medium containing salt and mannitol on which only gram positive organisms grow and a yellow halo surrounds Staphylococcus aureus is called a(n)Group of answer choicesSelective mediumEnrichment mediumselective and differential mediaselective and enriched mediaDifferential medium
Question
A culture medium containing salt and mannitol on which only gram positive organisms grow and a yellow halo surrounds Staphylococcus aureus is called a(n)Group of answer choicesSelective mediumEnrichment mediumselective and differential mediaselective and enriched mediaDifferential medium
Solution
The correct answer is "selective and differential media". This type of media, such as Mannitol Salt Agar, is both selective (it only allows certain types of organisms to grow) and differential (it differentiates between types of these organisms based on certain characteristics, such as the ability to ferment mannitol). In this case, it selects for gram positive organisms and differentiates Staphylococcus aureus from other gram positive organisms by the presence of a yellow halo, which indicates mannitol fermentation.
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