You counted 100 colonies of bacteria on a LB plate....

Question

You counted 100 colonies of bacteria on a LB plate. The plate was created using 100 ul of a 1:100000 dilution. What was the number of bacteria in the original stock?

Answer 1

100 colonies/100 ul x 100000 = 100000

 

Using scientific notation:

1x10² colonies/1x10² ul x 1x10⁵ = 1x10⁵ bacterial in the original solution