What is the original concentration (OCD) of bacteria in the stock sample this dilution came from?

You have an original cell density of 2.10 x 107 CFU/mL. What is this number in its non-scientific notation or “regular” format? If you’ve taken 500 ul of a bacterial culture and added 500 ul of DI water, you have achieved what dilution (i.e. what is the dilution factor)? Group of answer choices 1:4 (or […]