Question

In the sulfur cycle, microbes degrade organic sulfur compounds,such

as _________ to release H2S, which can be oxidizedby
Thiobacillus to _______________. This ion can
beassimilated into amino acids by _____________ or reduced
byDesulfovibrio to _______________. Hydrogen
Sulfide(H2S) is used by photoautotrophic bacteria as
anelectron donor to synthesize ______________. The
sulfur-containingby-product of this metabolism is_______________.

Answer 1

In the sulfur cycle, microbes degrade organic sulfur compounds,such

as (cysteine and methionine) to release H2S, which can be oxidized by

Thiobacillus to sulfate (SO42−).. This ion can be assimilated into amino acids by by plants, fungi and various prokaryotes. or reduced by Desulfovibrio to producing hydrogen sulfide gas . Hydrogen

Sulfide(H2S) is used by photoautotrophic bacteria as an electron donor to synthesize elemental sulfur (S8), The

sulfur-containing by-product of this metabolism H2S, elemental sulfur and metal sulfides.