What Is True About the Sulfur Cycle

Multiple Choice

What is true about the sulfur cycle?

A) H₂S is the oxidized form of sulfur.
B) Green and purple photosynthesizing bacteria oxidize H₂S.
C) Sulfates are utilized to become part of the carbohydrate molecules.
D) H₂S represents a source of energy for some autotrophic bacteria.
E) Both green and purple photosynthesizing bacteria oxidize H₂S and H₂S represents a source of energy for some autotrophic bacteria.