Multiple choice

The imidazole group of amino acid A and the guanidino group of amino acid B exist as resonance hybrids with positive charge distributed between both nitrogens in form A or all three nitrogens in form B. Write the names of the amino acids A and B.

  1. A. Histidine, B. Asparagine

  2. A. Asparagine, B. Histidine

  3. A. Valine, B. Asparagine

  4. A. Valine, B. Alanine

  5. A. Leucine, B. Isoleucine
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A Correct answer
Explanation

Yes,  the given pair is Histidine and Asparagine. The imidazole group of histidine and the guanidino group of arginine exist as resonance hybrids with positive charge distributed between both nitrogens (histidine) or all three nitrogens (arginine).

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