What is true about the nitrogen cycle?
A)The form of nitrogen present in significant levels in the atmosphere is easily assimilated by most organisms.
B)Most of the nitrogen in the atmosphere exists as organic molecules.
C)The activity of specific types of microorganisms is important to convert atmospheric nitrogen molecules into usable forms.
D)Both most of the nitrogen in the atmosphere exists as organic molecules and the activity of specific types of microorganisms is important to convert atmospheric nitrogen molecules into usable forms.
E)All organisms can incorporate atmospheric nitrogen into their proteins and nucleic acids.

Question

Quizplus · Accepted Answer

The nitrogen gas in the atmosphere cannot be used by most organisms directly, and needs to be converted into usable forms such as ammonium and nitrate. This conversion is carried out by specific types of microorganisms such as nitrogen-fixing bacteria and archaea, which are important in the nitrogen cycle.

What Is True About the Nitrogen Cycle