after performing a spread plate, you count 110 colonies on your plate that has a dilution factor of 10⁻⁴. you know you plated 100 μl of your sample on the plate. what is the cfu/ml of the original undiluted sample?
O 1.1×10⁻⁷ CFU/mL
O 1.1×10⁻⁵ CFU/mL
O 1.1×10⁶ CFU/mL
O 1.1×10⁷ CFU/mL
