MIC 200 CHAPTER 2 EXAM | QUESTIONS
WITH WELL VERIFIED ANSWERS | RATED A+
|116 Qs & ANSWERS LATEST 2026/27
1. Explain how pH influences the structure and function of enzymes.
pH does not influence enzyme structure or function.
pH affects the temperature of the reaction, which in turn affects
enzyme activity.
pH alters the ionization of functional groups, impacting enzyme
structure and function.
pH changes the substrate concentration, which affects enzyme activity.
2. If an experiment shows that increasing urea concentration leads to a
decrease in the maximum reaction rate (Vmax) of an enzyme, what can be
inferred about the type of inhibition urea is exhibiting?
Urea is acting as a competitive inhibitor.
Urea is acting as a non-competitive inhibitor.
Urea has no effect on the enzyme.
Urea is acting as an uncompetitive inhibitor.
3. Explain how urea's classification as a competitive or non-competitive inhibitor
might influence enzyme kinetics.
It affects the maximum reaction rate (Vmax) only.
It alters the Michaelis constant (KM) without changing Vmax.
,It has no effect on enzyme kinetics.
It increases the substrate concentration required for maximum
reaction rate.
,4. If an experiment shows that increasing substrate concentration leads to a
plateau in reaction rate, what can be inferred about the enzyme's behavior
according to the Michaelis-Menten model?
The enzyme is saturated with substrate, and the reaction rate is at
Vmax.
The enzyme is not functioning properly.
The reaction rate will continue to increase indefinitely.
The substrate concentration is too low for any reaction to occur.
5. Why are protease inhibitors used in HIV treatments?
They prevent HIV from making enzymes and structural proteins
They enable the body to eliminate HIV cells
They prevent HIV from mutating while copying itself
They prevent the HIV virus from replicating itself
6. What happens to enzyme activity when the temperature exceeds the optimal
range?
Enzyme activity remains constant.
Enzyme activity increases indefinitely.
Enzymes may denature and lose activity.
Enzyme activity decreases linearly.
7. What is formed when a substrate binds to the active site of an enzyme?
Enzyme-product complex
Enzyme-inhibitor complex
, Enzyme-substrate complex
Enzyme-cofactor complex
8. Explain how a Lineweaver-Burk plot can be utilized to analyze enzyme
kinetics. What information does it provide?
It provides the temperature range for enzyme activity.
It helps visualize the effect of pH on enzyme reactions.
It allows for the determination of KM and Vmax by linearizing the
Michaelis-Menten equation.
It shows the relationship between enzyme concentration and
substrate concentration.
9. If an enzyme has a dissociation constant (KI) of 10 µM for a specific inhibitor,
what can be inferred about the enzyme's affinity for the inhibitor compared to
another enzyme with a KI of 1 µM for the same inhibitor?
The first enzyme has a higher affinity for the inhibitor.
The second enzyme has a higher affinity for the inhibitor.
Both enzymes have the same affinity for the inhibitor.
The affinity cannot be determined without additional information.
10. What is the primary role of the active site in the formation of the enzyme-
substrate complex (ES)?
To provide energy for the reaction
To bind the substrate and facilitate the reaction
To stabilize the enzyme structure
To release products after the reaction
WITH WELL VERIFIED ANSWERS | RATED A+
|116 Qs & ANSWERS LATEST 2026/27
1. Explain how pH influences the structure and function of enzymes.
pH does not influence enzyme structure or function.
pH affects the temperature of the reaction, which in turn affects
enzyme activity.
pH alters the ionization of functional groups, impacting enzyme
structure and function.
pH changes the substrate concentration, which affects enzyme activity.
2. If an experiment shows that increasing urea concentration leads to a
decrease in the maximum reaction rate (Vmax) of an enzyme, what can be
inferred about the type of inhibition urea is exhibiting?
Urea is acting as a competitive inhibitor.
Urea is acting as a non-competitive inhibitor.
Urea has no effect on the enzyme.
Urea is acting as an uncompetitive inhibitor.
3. Explain how urea's classification as a competitive or non-competitive inhibitor
might influence enzyme kinetics.
It affects the maximum reaction rate (Vmax) only.
It alters the Michaelis constant (KM) without changing Vmax.
,It has no effect on enzyme kinetics.
It increases the substrate concentration required for maximum
reaction rate.
,4. If an experiment shows that increasing substrate concentration leads to a
plateau in reaction rate, what can be inferred about the enzyme's behavior
according to the Michaelis-Menten model?
The enzyme is saturated with substrate, and the reaction rate is at
Vmax.
The enzyme is not functioning properly.
The reaction rate will continue to increase indefinitely.
The substrate concentration is too low for any reaction to occur.
5. Why are protease inhibitors used in HIV treatments?
They prevent HIV from making enzymes and structural proteins
They enable the body to eliminate HIV cells
They prevent HIV from mutating while copying itself
They prevent the HIV virus from replicating itself
6. What happens to enzyme activity when the temperature exceeds the optimal
range?
Enzyme activity remains constant.
Enzyme activity increases indefinitely.
Enzymes may denature and lose activity.
Enzyme activity decreases linearly.
7. What is formed when a substrate binds to the active site of an enzyme?
Enzyme-product complex
Enzyme-inhibitor complex
, Enzyme-substrate complex
Enzyme-cofactor complex
8. Explain how a Lineweaver-Burk plot can be utilized to analyze enzyme
kinetics. What information does it provide?
It provides the temperature range for enzyme activity.
It helps visualize the effect of pH on enzyme reactions.
It allows for the determination of KM and Vmax by linearizing the
Michaelis-Menten equation.
It shows the relationship between enzyme concentration and
substrate concentration.
9. If an enzyme has a dissociation constant (KI) of 10 µM for a specific inhibitor,
what can be inferred about the enzyme's affinity for the inhibitor compared to
another enzyme with a KI of 1 µM for the same inhibitor?
The first enzyme has a higher affinity for the inhibitor.
The second enzyme has a higher affinity for the inhibitor.
Both enzymes have the same affinity for the inhibitor.
The affinity cannot be determined without additional information.
10. What is the primary role of the active site in the formation of the enzyme-
substrate complex (ES)?
To provide energy for the reaction
To bind the substrate and facilitate the reaction
To stabilize the enzyme structure
To release products after the reaction
