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Agar plate. An agar plate is a Petri dish that contains a growth medium (typically agar plus nutrients) used to culture microorganisms or small plants like the moss Physcomitrella patens. Selective growth compounds may also be added to the media, such as antibiotics.
These captive-bred bacteria are totally dependent on people to provide the proper environment for their survival and growth. Article Summary: MacConkey's Agar is a specialized bacterial growth medium that is selective for Gram-negative bacteria and can differentiate those Gram-bacteria that are able to ferment lactose.