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In which amino acid Imidazole group, an aromatic ring found?

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In which amino acid Imidazole group, an aromatic ring found?

(a) Lysine

(b) Arginine

(c) Histidine

(d) Glutamate

I got this question in a national level competition.

This is a very interesting question from Amino Acids and Proteins topic in chapter Biomolecules and Catalysis of Life Sciences

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Right choice is (c) Histidine

The best I can explain: Histidine contains imidazole group which can be uncharged or positively charged, depending on its local environment. Lysine & arginine contains positively charged R group while glutamate has negatively charged R group.

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