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(A) Tyrosinase is a copper-containing enzyme that catalyzes the oxidation of phenols,such as tyrosine,to quinones. It is essential for the synthesis o

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Copper

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(A) Tyrosinase is a copper-containing enzyme that catalyzes the oxidation of phenols,such as tyrosine,to quinones. It is essential for the synthesis of melanin in humans and other organisms. The active site of the tyrosinase enzyme contains two copper ions $(Cu^{2+})$ coordinated by histidine residues,which are crucial for its catalytic activity.

The structural component of tyrosinase is .........

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