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The evolutionary advantage that would be there to the formation of a pellicle in a liquid medium by a bacterium is they could form colonies and have a greater chance of survival. Two ways to determine motility of a bacteria is using a agar deep or the hanging drop technique.

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9y ago
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10y ago

Look at where the pellicle forms. Usually it is on the surface (where the bacteria grows better because of easier access to the oxygen in the atmosphere or somewhere the water is moving so new nutrients are continually passing by to be eaten.

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Q: Why do some organisms form a pellicle on liquid media?
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