Multiple choice

Amino acids are the building blocks of proteins and act as intermediates in metabolism. The amino acid having an imidazole ring is

  1. glutamate

  2. lysine

  3. histidine

  4. arginine
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Histidine has an imidazole ring which often sits inside the active site of an enzyme and helps bonds to be broken or made. It can do this because it can exist in two states -uncharged, or positively charged.

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