1. You notice a ""rotten egg"" smell coming from the black goo in the iron drain pipe in your kitchen. You could get rid of the smell by adding which of the following? A. Sulfate reducers B. Purple sulfur bacteria C. Methanogenic bacteria D. Clostridial spores E. Sulfur oxidizing bacteria

The correct answer is letter B

Designation of the group of bacteria, not related to each other, that use sulfur, sulfides or sulfates in their metabolism. The photoautotrophic, green or red anaerobic bacteria use hydrogen sulfide as a source of electrons for photosynthesis, producing sulfur as a final product. Sulfur oxidizing cheiautotrophic bacteria, or their compounds, produce sulfates as the final product. The sulphate-reducing heterotrophic anaerobic bacteria need sulphates for their breathing, obtaining energy by reducing sulfur or hydrogen sulphide.

you probably know the answer. stop asking stupid questions and making me waste my time. j.k. ; )   b.t.w. what are three ratios equivalent to 5 : 11? thx