Understanding the Role of Zinc Ion in Alcohol Dehydrogenase Catalysis

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Zinc ion (Zn++) is essential for the function of alcohol dehydrogenase, acting primarily as a cofactor rather than a coenzyme. It facilitates the enzyme's interaction with ethanol at the active sites, enhancing catalytic activity. The zinc ion does not carry substrates to the enzyme or serve as a product of the reaction. The discussion emphasizes the importance of correctly identifying the role of zinc in enzymatic processes. Understanding these roles is crucial for comprehending enzyme catalysis mechanisms.
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Homework Statement



Alcohol dehydrogenase is an enzyme that catalyzes the catabolism of ethanol (an alcohol). In order to function, the enzyme requires a zinc ion (Zn++).
What is the best description of Zn++ in relation to alcohol dehydrogenase?

The zinc ion also acts as an enzyme.
The zinc ion carries substrates to the enzymes.
The zinc ion is one of the products of the reaction catalyzed by this enzyme.
The zinc ion helps the enzyme interact with ethanol at the active sites.
The zinc ion is a coenzyme.

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The Attempt at a Solution



I know zinc is a cofactor not a coenzyme and it doesn't carry the substrate to the enzyme but i can't figure out what the best answer is
 
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