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Figurę 5.2 Bacteria in Culture (a) Most bacteria can be grown under a variety of conditions in liquid culture media or on solid media such as the Petri dish shown here. On solid media, many bacteria grow in circular clusters called colonies. Colonies typically begin with a single celi. which divides rapidly to produce a spot visible to the naked eye. A single colony may contain millions of individual bacterial cells. (b) Bacteria can also be grown in large-scale quantities. The fermenters shown here contain several hun-dred gallons of bacteria growing in liquid culture. These fermenters function as bioreactors that serve many purposes such as growing bacteria for isolating recombinant proteins and culturing yeast to produce winę.