Which of the following describes the major significance of the element nitrogen in the human body?
a) ionized form makes body fluids acidic
b) ionized form is most plentiful anion in extracellular fluid
c) ionized form is needed for action of many enzymes
d) is a component of all proteins and nucleic acids
e) ionized form is most plentiful cation in extracellular fluid
Answer: d
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