Name _____________________
Class _____________________
A. Calculate the final dilution of each of these series. Write your answer in scientific notation.
1. 1:1000, 1: 100, 1:100 ____________________
2. 1:10, 1:100, 1:1000 _____________________
3. 1/10, 1/1000, 1/100 _____________________
4. 10^-3, 10^-2, 10^-1 _____________________
5. 10^-1, 10^-3, 10^-3 _____________________
6. 1/100, 1/100, 1/100 _____________________
7. 1:100, 1:1000, 1:10,000 _____________________
8. 10^-2, 10^-2, 10^-1 _____________________
9. 1/1000, 1/1000, 1/10 _____________________
10. 10^-1, 10^-2, 10^-1 _____________________
B. Calculate the actual cell concentration (the number of cells per milliliter of solution) in the bacterial culture based on the plate counts and dilutions given below.
| Plate counts (number of cells per plate counted) | Final dilution (the amount that the original sample was diluted before being grown on the plate) | Actual cells per milliliter in the original culture |
| 202 | 10^-5 |
|
| 157 | 1:10,000 | |
| 180 | 1/1000 | |
| 106 | 10^-6 | |
| 85 | 1:100,000 | |
| 275 | 1/10,000 | |
| 200 | 10^-3 | |
| 99 | 10^-8 | |
| 155 | 1/10,000 | |
| 198 | 1:1,000,000 |