Why was the coliform group of bacteria selected as an indicator for pathogenic
a. Coliforms are easier to identify than specific pathogens.
b. Coliforms are pathogenic to man.
Water containing pathogens will almost certainly contain coliforms.
d. Water containing coliforms will almost certainly contain pathogens.
During bacteriological analysis, which reducing agent is added to the sample bottle
to neutralize any remaining chlorine residual?. __________________________.
Bacteriological samples should not be taken from hot water faucets or faucets that
Why are the hood and screw cap removed from the sample bottle and held
Water samples for bacteriological analysis should be refrigerated if they wail not
be examined within _______ hr.
In natural bathing waters, water samples should be collected _______ feet from
shore and at least _________ feet deep?.
Which of the following are disadvantages of the multiple--tube fermentation
technique in conducting bacteriological analysis on water?
a. Time required.
b. Accuracy of results.
In which technique are the coliform bacteria retained on the filter when the water
passes through? _________________________________.