Multiple Choice
Do enzymes lower the overall change in free energy (\(\Delta G\)) of a chemical reaction?
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6. Enzymes and Enzyme Kinetics
Enzyme-Substrate Complex
Multiple Choice
In the context of the enzyme-substrate complex, the active site of an enzyme is the region that:
A
Binds the substrate and catalyzes the chemical reaction by stabilizing the transition state
B
Serves as the primary site for ATP production in the cell
C
Provides the genetic information needed to synthesize the enzyme
D
Is cleaved off after each catalytic cycle to regenerate the enzyme
Verified step by step guidance1
Understand that the active site of an enzyme is a specific region where the substrate binds. This site is typically a pocket or groove on the enzyme's surface.
Recognize that the active site not only binds the substrate but also facilitates the chemical reaction by stabilizing the transition state, lowering the activation energy required for the reaction to proceed.
Eliminate options that do not describe the function of the active site: it is not involved in ATP production (which occurs in organelles like mitochondria), nor does it provide genetic information (which is stored in DNA), and it is not cleaved off after each catalytic cycle (enzymes are generally reusable).
Focus on the role of the active site in catalysis, which involves substrate binding and transition state stabilization, key features that define enzyme specificity and efficiency.
Conclude that the correct description of the active site is that it binds the substrate and catalyzes the chemical reaction by stabilizing the transition state.
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