Question

Compare and contrast as completely as possible the metabolism of sulfide-oxidizers with that of sulfate-reducing bacteria.

Answer 1

Answer-

Sulfide oxidizing bacteria	Sulfate reducing bacteria
They are chemolithotrophs. They are aerobic or anaerobic	They are organotrophs or lithotrophy. They are strictly anaerobes
They oxidize sulfide and elemental sulfur	They reduce sulfate to sulfide
The sulfide:quinone oxidoreductase pathway is catalyzed by membrane bound flavocytochrome c- sulfide dehydrogenase to oxidize sulfide	ATP- sulfurylase activates sulfate with energy of ATP to create adenosine 5'-phosphosulfate (APS).
The Sox pathway is catalyzed by thiosulfate-oxidizing multienzyme complex and sulfide is bound to SoxY enzyme then converted to sulfate	APS is then reduced to sulfide with conversion of AMP to ADP using energy of ATP by the enzyme dissimilatory sulfite reductase.
Electron donor is sulfide and electron acceptor is CO2	Electron donors are acetate, butyrate, ethanol, propionate, H2, HCOO-