Multiple Choice
Which part of the enzyme allows substrate specificity?
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6. Enzymes and Enzyme Kinetics
Enzyme-Substrate Complex
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
In the enzyme-substrate complex pictured below, which of the following best describes the role of the active site?
A
It acts as a non-specific binding site for all molecules.
B
It binds specifically to the substrate, facilitating the conversion to product.
C
It permanently modifies the enzyme's structure after substrate binding.
D
It provides energy for the reaction by hydrolyzing ATP.
Verified step by step guidance1
Understand the concept of an enzyme's active site: The active site is a specific region on the enzyme where the substrate binds. It is highly selective and matches the substrate's shape and chemical properties, ensuring specificity.
Clarify the role of the active site: The active site facilitates the conversion of the substrate into the product by stabilizing the transition state and lowering the activation energy of the reaction.
Eliminate incorrect options: Review each option provided in the problem. For example, the active site does not act as a non-specific binding site for all molecules, nor does it permanently modify the enzyme's structure after substrate binding.
Address the energy aspect: The active site does not provide energy for the reaction by hydrolyzing ATP. Instead, it catalyzes the reaction by interacting with the substrate and stabilizing intermediates.
Select the correct description: Based on the above clarifications, the correct answer is that the active site binds specifically to the substrate, facilitating its conversion to the product.
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