Which of the Following Describes the Major Significance of the Element

Multiple Choice

Which of the following describes the major significance of the element nitrogen in the human body?

A) The ionized form makes body fluids acidic.
B) The ionized form is most plentiful anion in extracellular fluid.
C) The ionized form is needed for action of many enzymes.
D) It is a component of all proteins and nucleic acids.
E) The ionized form is most plentiful cation in extracellular fluid.