18 Questions
Which type of reversible inhibitor has a molecular structure similar to the normal substrate of the enzyme?
Competitive inhibitor
What type of inhibitor binds to the active site of an enzyme and competes with substrate molecules?
Competitive inhibitor
In the induced-fit model, what changes when the substrate binds to the enzyme?
The enzyme structure changes
Which theory describes the perfect fit between the enzyme's active site and the substrate?
Lock and key theory
What is the name for enzymes that catalyze the same reaction but differ in physical and chemical properties?
Isoenzymes
Which equation describes the rate of enzymatic reactions as a function of substrate concentration?
Michaelis-Menten equation
What model suggests that the active site of an enzyme forms a complementary shape to the substrate after the substrate has been bound?
Induced-fit model
Which theory explains that the active site changes shape as it interacts with the substrate?
Induced-fit model
In the lock and key theory, what does the active site of the enzyme resemble in terms of fitting with the substrate?
A lock and key
In the Michaelis-Menten equation, what does Km represent?
Michaelis constant
What happens when [S] is much less than Km in terms of the velocity of the reaction?
The velocity is proportional to the substrate concentration
Which theory suggests that once the substrate is fully locked into position, catalysis can begin?
Induced-fit model
What does the Vmax in the Michaelis-Menten equation signify?
Initial reaction velocity
What is the main limitation of the lock and key theory in explaining enzyme-substrate binding?
Rigidity of the active site related to the substrate
How does the induced-fit model differ from the lock and key theory in terms of enzyme-substrate binding?
Active site changes shape to match substrate vs. static fit in lock and key
Which complex is formed when an enzyme reversibly combines with its substrate according to Michaelis and Menten?
ES complex
What conclusion can be drawn about the relationship between enzyme concentration and reaction rate in Michaelis-Menten kinetics?
The rate is directly proportional to enzyme concentration
What aspect of the enzyme changes upon substrate binding in the induced-fit model?
Shape of the active site
Test your knowledge on how substrates bind to an enzyme's active site and the theories explaining this process. Explore concepts such as the lock and key theory, and the limitations of this model.
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