Exam 1 Lecture 7

UIC BioS 101 Nyberg

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Culture of microorganisms

• One of the common ways to grow bacteria is on a nutrient gel in a petri dish.

• The gel is mostly (98%) water with some nutrients but it behaves like a solid.

• The ‘daughters’ of the original cell do not move much and the population (colony) becomes visible as a dot (spot) on the gel.

Speaker Notes:

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Figure 27.6B shows a petri dish but it that case the bacterial ‘dots’ are so close together the bacteria appear as a streak.