What Is True About the Nitrogen Cycle

question 10

Multiple Choice

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.