Serial Dilution Homework

resultant Dilution Homework Problems Name_Vidya Punati_____________________ Section __36_______________________ 1. In the escort above, the closing dilution is 1____1X10-8___________________. 2. You make six 2-fold serial dilutions of a solution. Your final dilution will be 1_64_________. 3. You dilute 1 ml of an dark assay of bacterium to 1 x 10-6 and plate out one(a) hundred? l onto a Petri dish. The next day you count 64 colonies.The issue of viable bacteria in the original sample was a. 6. 4 x 107 cells/ml b. 6. 4 x 108 cells/ml c. 6. 4 x 109 cells/ml d. 6. 4 x 1010 cells/ml 4. A 1 ml sample of bacteria was diluted to 10-6 and 100? l was plated on the Petri dish at right. What was the approximate concentration of the original sample? 8 x 107 bacteria per mL. 5. What are two reasons serial dilution is a useful technique for counting populations of bacteria? ) When there are a visual sense of bacteria, it is hard to count undiluted colonies accurately because there cou ld be hundreds of them. Serial dilution is a useful technique because the colonies are counted twice with different multitude and the average number of colonies is reported as the number of bacteria puzzle in the sample after multiplying the dilution factor. 2) If the number of bacteria in the samples is high, colonies of bacteria are likely to cover the whole plate so that one cannot count any colonies at all.