Resonance structures of lysine and cause of its basic nature

Lysine is one of the most important amino acids. IUPAC name it as **2,6 - diaminohexanoic acid** . But what are its resonance forms?? And can resonance tell why it is basic??? Please help.




The group that constitutes the side chain is nothing but a primary amine. That explains the high pKa of ~ 10.5 (compare propylamine (pka ~10.9). No need to invoke resonance. Are you perhaps thinking of arginine? 


![Lysine](https://i.stack.imgur.com/jUkI8.png)


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