Question

three sulfur metabolism processes a, b, c are shown. which one(s) represent lithotrophy? a: organic sulfur to h2s b: so to so4 c: h2s to so plants bacteria organic sulfur (protein) sh fungi bacteria

Explanation:

Lithotrophy involves the use of inorganic compounds as electron - donors. Process C shows the conversion of hydrogen sulfide ($H_2S$), an inorganic compound, to elemental sulfur (S). This is a characteristic lithotrophic process as lithotrophs can use inorganic substances like $H_2S$ to obtain energy. Process A involves organic sulfur compounds and process B is the oxidation of elemental sulfur to sulfate, which are not typical lithotrophic processes.

Answer:

C