A researcher sets up the following dilution to determine phage titer of a sample. For Tube A, 0.5 mL stock is added to 4.5 mL diluent. For Tube B, 1 mL from Tube A is mixed with 9 mL diluent. For Tube C, 0.5 mL from Tube B is added to 9.5 mL diluent.  From Tube C, 0.025 mL of this is used to set up a plaque assay with a susceptible host. After incubation, 88 plaques are counted. What was the phage titer in the stock? Just type in the big number below without units, Canvas doesn't allow exponents. However, please use scientific notation on your assignments and exams.    简答题

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