Nitrogen is an essential component of ____________________?
Correct answer: D. Proteins
- A. Mineral salts
- B. Carbohydrates
- C. Fats
- D. Proteins
Explanation
Proteins contain nitrogen because their amino acids include amino groups, unlike carbohydrates and fats, which normally contain only carbon, hydrogen, and oxygen. Mineral salts are not the biological macromolecule intended here.
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