In a two-step serial dilution with each step performing a 1:10 dilution, what is the overall dilution factor?

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Multiple Choice

In a two-step serial dilution with each step performing a 1:10 dilution, what is the overall dilution factor?

Explanation:
In a serial dilution, each 1:10 step reduces the concentration to one-tenth. Do this twice in sequence: one-tenth times one-tenth equals one-hundredth of the original, so the overall dilution is 100-fold. Put another way, two consecutive 1:10 dilutions multiply to 100. The other numbers would require more or fewer steps (three steps give 1000, a single step gives 10).

In a serial dilution, each 1:10 step reduces the concentration to one-tenth. Do this twice in sequence: one-tenth times one-tenth equals one-hundredth of the original, so the overall dilution is 100-fold. Put another way, two consecutive 1:10 dilutions multiply to 100. The other numbers would require more or fewer steps (three steps give 1000, a single step gives 10).

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