Question:
Which amino acid from following contains highest number of N atoms in it?
Which amino acid from following contains highest number of N atoms in it?
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Memory trick:
Arginine = Richest in nitrogen (guanidine group)
Updated On: May 8, 2026
- Histidine
- Lysine
- Arginine
- Glutamine
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The Correct Option is C
Solution and Explanation
Concept: Amino acids contain nitrogen atoms in:
• Amino group ($-\text{NH}_2$)
• Side chain (if present)
Step 1: Count nitrogen atoms.
• Histidine: 3 N atoms (imidazole ring + amino group)
• Lysine: 2 N atoms (two amino groups)
• Arginine: 4 N atoms (guanidine group + amino group)
• Glutamine: 2 N atoms
Step 2: Comparison.
Arginine contains maximum nitrogen atoms.
Step 3: Conclusion.
Thus, arginine has highest number of N atoms. Final Answer: Option (C)
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