Which technique would be used to estimate the concentration of naturally occurring Escherichia coli in a wastewater sample?
A) agar dilution tube method
B) laser tweezers method
C) most probable number (MPN) method
D) cell tagging using GFP method

Question

Quizplus · Accepted Answer

The most probable number (MPN) method is commonly used to estimate the concentration of natural occurring Escherichia coli in a wastewater sample. This method involves multiple dilutions of the sample which are then inoculated into a series of tubes containing growth medium. The tubes are then observed for bacterial growth and the concentration of bacteria is estimated based on the number of positive tubes. This method is commonly used for waters with low bacterial concentrations.

Which Technique Would Be Used to Estimate the Concentration of Naturally