Discussion
Among the following, the structure representing histidine is
- A.
- B.
- C.
- D.
Answer: C
Histidine is structure (C).
Histidine is an alpha-amino acid whose side chain is a CH2 attached to C4 of an imidazole ring, a five-membered ring with nitrogens at positions 1 and 3. (C) shows the zwitterion with exactly that: one CH2 linking the alpha carbon to the imidazol-4-yl ring.
(A) has a pyrazole ring, with its two nitrogens adjacent. (B) attaches the imidazole through C2, the carbon between the two nitrogens. (D) has the right ring but a two-carbon linker, one CH2 too many (homohistidine).
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