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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.
Starch agar is a general-purpose, nutrient medium used for the cultivation of microbes. Inclusion of starch makes it a rich medium for those bacteria possessing the enzyme alpha-amylase, which breaks starch down to its component glucose molecules.This medium, therefore, is useful for the detection of alpha-amylase.nclusion of starch makes it a rich medium for those bacteria possessing the enzyme alpha-amylase, which breaks starch down to its component glucose molecules. This medium, therefore, is useful for the detection of alpha-amylase.