Answer
Carbohydrates
Work Step by Step
In the sulfur cycle, microbes degrade organic sulfur compound such as amino acids to release $H_{2}S$ which can be oxidized by Thiobacillus to $SO_{4}^{2-} $. This ion can be assimilated into amino acids by plants and bacteria or reduced into $H_{2}S$. $H_{2}S$ is used by photoautotropic bacteria as an electron donor to synthesize Carbohydrates.
