Multiple Choice
Regarding the enzyme-substrate complex, which statement is most accurate about how enzymes bind reactants?
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6. Enzymes and Enzyme Kinetics
Enzyme-Substrate Complex
Multiple Choice
In the context of the enzyme-substrate complex, the shape (three-dimensional conformation) of an enzyme is most important to its ability to do which of the following?
A
Bind its specific substrate at the active site to form an enzyme-substrate complex
B
Increase the equilibrium constant of the overall reaction
C
Provide energy to make an endergonic reaction spontaneous
D
Convert reactants into products without undergoing any conformational changes
Verified step by step guidance1
Understand that enzymes are biological catalysts that speed up reactions by lowering the activation energy, and their function depends heavily on their three-dimensional shape or conformation.
Recognize that the active site of an enzyme is a specific region where the substrate binds; this site’s shape is complementary to the substrate, allowing for specific binding.
Realize that the enzyme’s shape is crucial for substrate recognition and binding, forming the enzyme-substrate complex, which is the first step in catalysis.
Note that enzymes do not change the equilibrium constant of a reaction; they only speed up the rate at which equilibrium is reached by lowering activation energy.
Understand that enzymes often undergo conformational changes upon substrate binding (induced fit), so the statement that they convert reactants without any conformational changes is incorrect.
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