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Agar is used to culture bacteria and as a medium in electrophoresis. The agar used in this Petri dish is a by-product of an unlikely organism. Agar is extracted from a(n)

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Agar is extracted from an algae (agarophytes, belong to the Rhodophyta (red algae) phylum, primarily from the genera Gelidium and Gracilaria).
Agar or agar-agar is a jelly-like substance. Agar is the mixture of two components, agaropectin (D-glucuronic acid and pyruvic acid) and the polysaccharide agarose.
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