The Microbial Nitrogen and Sulfur Cycles Have Many Features in Common

Multiple Choice

The microbial nitrogen and sulfur cycles have many features in common. In what ways are they different?

A) The nitrogen cycle includes chemoautotrophic microorganisms, but the sulfur cycle does not.
B) The sulfur cycle includes photoautotrophic bacteria, but the nitrogen cycle does not.
C) The nitrogen cycle includes metabolic processes that make abundant sources of inorganic nitrogen available to primary producers.
D) The sulfur cycle requires oxygen for completion.