The presence of specific ________ signals that a given water source might be contaminated with pathogens.

Question

Quizplus · Accepted Answer

The best choice is D, indicator microorganisms. Indicator microorganisms such as Escherichia coli and coliform bacteria are commonly used to determine whether water is contaminated with pathogens, as their presence indicates a higher likelihood of fecal contamination and the potential presence of harmful microorganisms. Exotoxins and endotoxins are toxic substances produced by some bacteria but are not directly used to identify water contamination. Chemical compounds could indicate contamination, but without knowing the specific compounds or their sources, this choice is not specific enough.

The Presence of Specific ________ Signals That a Given Water