Nitrogen is present in___________?
Correct answer: B. proteins
- A. carbohydrates
- B. proteins
- C. lipids
- D. carbonates
Explanation
Proteins contain nitrogen because their amino acids have amino groups, written as -NH2, in addition to carbon, hydrogen, and oxygen. Most carbohydrates and lipids do not contain nitrogen in their basic structures, so students may choose lipids if they incorrectly generalize that all major organic molecules have the same elements.
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