A culture medium on which only gram-positive organisms grow, and in which a yellow halo surrounds Staphylococcus aureus colonies, distinguishing S. aureus from other growing species, is best described as
a. a selective, but not differential medium.
b. a differential, but not selective medium.
c. an enrichment culture
d. both a selective and differential medium.
e. both a differential and enrichment culture.
Ans: d. both a selective and differential medium.
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MDMA, the active ingredient in Ecstacy,
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A spontaneous reaction
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Nitrogen fixation is the process by which gaseous nitrogen is converted to nitrate
____________________ Indicate whether the statement is true or false.