A liquid culture of $E .$ coli at a concentration of $2 \times 10^{8}$ cells/ml was diluted serially, as shown in the following diagram, and $0.1 \mathrm{ml}$ of cells from the final two test tubes were spread on agar plates containing rich medium. How many colonies do you expect to grow on each of the two plates?
Added by Pedro G.
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The initial concentration of E. coli is $2 \times 10^8$ cells/ml. Show more…
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