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Multiple Choice
In the context of the enzyme-substrate complex, a reactant molecule that binds to an enzyme’s active site is called a:
A
product
B
substrate
C
coenzyme
D
allosteric inhibitor
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1
Understand the terminology related to enzyme-catalyzed reactions: enzymes bind specific molecules to their active sites to facilitate a chemical reaction.
Identify the molecule that initially binds to the enzyme's active site before any reaction occurs; this molecule is called the substrate.
Recognize that the substrate undergoes a transformation during the reaction, resulting in the formation of the product, which is released from the enzyme.
Note that a coenzyme is a non-protein molecule that assists enzymes but is not the molecule that directly binds as the reactant at the active site.
Understand that an allosteric inhibitor binds to a site other than the active site, causing a change in enzyme activity, but it is not the reactant molecule itself.