4. Watch the web movie on the Winogradsky column and answer these questions:Web address (It is better use Chrome or another browser besides internet explorer): http://www.sumanasinc.com/webcontent/anisamples/microbiology/winogradsky.html a) Which microorganisms convert

cellulose to organic acids (fermentation)? b) What is the substrate (carbon and energy source) that supports sulfate reduction? c) Which photoautotrophic bacteria utilize H,S and light as e-donors and energy,respectively? e) What is the source of O2 for the Beggiatoa? d) What is the reaction carried out by the aerobic chemolithoautotrophic Beggiatoa? f) Describe the O2 gradient as a function of column height? g) Describe the H2S gradient as a function of column height?