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microbiology: based on these results which bacterium is truly motile? how do you know?

MAT SA
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Answer: The bacteria SM is a motile. The motility of bacteria depends upon the their flagella as well as intracellular fibrillis. It can be seen under the microscope. The another method to know about the motility is the more turbid the side of sample, the more motile bacteria is. So, in this case the SM is more motile.

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