Q: Which of the following best describes the effect of a competitive inhibitor on enzyme kinetics?

It does not change $V_\text{max}$ but increases $K_m$.

Q: A noncompetitive inhibitor binds to an enzyme. What is the expected effect on $V_\text{max}$ and $K_m$?

$V_\text{max}$ decreases, $K_m$ unchanged

Q: A patient is given a drug that acts as a noncompetitive inhibitor for a key metabolic enzyme. What is the most likely effect on the enzyme's maximum velocity ($V_\text{max}$) and Michaelis constant ($K_m$)?

$V_\text{max}$ decreases, $K_m$ unchanged

Q: Which of the following changes would you expect in the presence of a mixed inhibitor?

$V_\text{max}$ decreases, $K_m$ increases or decreases

Q: Which of the following statements is true regarding the effect of a competitive inhibitor on enzyme kinetics?

$K_m$ increases and $V_\text{max}$ remains unchanged.

Question 1

Which of the following best describes the effect of a competitive inhibitor on enzyme kinetics?

Accepted Answer

It does not change $V_	ext{max}$ but increases $K_m$.

Question 2

A noncompetitive inhibitor binds to an enzyme. What is the expected effect on $V_	ext{max}$ and $K_m$?

Accepted Answer

$V_	ext{max}$ decreases, $K_m$ unchanged

Question 3

Which type of enzyme inhibition can be overcome by increasing substrate concentration?

Accepted Answer

Competitive inhibition

Question 4

In a Lineweaver-Burk plot, which type of inhibition is indicated if the lines intersect on the y-axis?

Accepted Answer

Competitive inhibition

Question 5

A patient is given a drug that acts as a noncompetitive inhibitor for a key metabolic enzyme. What is the most likely effect on the enzyme's maximum velocity ($V_	ext{max}$) and Michaelis constant ($K_m$)?

Accepted Answer

$V_	ext{max}$ decreases, $K_m$ unchanged

Question 6

Which of the following statements about allosteric enzymes is correct?

Accepted Answer

They can be regulated by molecules binding at sites other than the active site.

Question 7

If an inhibitor binds only to the enzyme-substrate complex, what type of inhibition is this?

Accepted Answer

Uncompetitive inhibition

Question 8

Which of the following changes would you expect in the presence of a mixed inhibitor?

Accepted Answer

$V_	ext{max}$ decreases, $K_m$ increases or decreases

Question 9

A researcher observes that an inhibitor decreases $V_	ext{max}$ but does not affect $K_m$. What type of inhibition is most likely?

Accepted Answer

Noncompetitive inhibition

Question 10

Which of the following best describes the effect of an allosteric inhibitor?

Accepted Answer

It binds to a site other than the active site and changes enzyme conformation.

Question 11

Which graphical representation is typically used to distinguish between different types of enzyme inhibition?

Accepted Answer

Lineweaver-Burk plot

Question 12

A drug is found to decrease both $V_	ext{max}$ and $K_m$ of an enzyme. What type of inhibition does this suggest?

Accepted Answer

Uncompetitive inhibition

Question 13

Which of the following is a characteristic of allosteric enzymes?

Accepted Answer

They display a sigmoidal (S-shaped) kinetic curve.

Question 14

Which of the following statements is true regarding the effect of a competitive inhibitor on enzyme kinetics?

Accepted Answer

$K_m$ increases and $V_	ext{max}$ remains unchanged.

Question 15

Which type of inhibition is characterized by the inhibitor binding to both the free enzyme and the enzyme-substrate complex, but with different affinities?

Accepted Answer

Mixed inhibition

Question 16

A Lineweaver-Burk plot shows parallel lines for different inhibitor concentrations. What type of inhibition is this?

Accepted Answer

Uncompetitive inhibition

Question 17

Which of the following best describes the effect of an allosteric activator?

Accepted Answer

It binds to a regulatory site and increases enzyme activity.

Question 18

Which of the following is NOT a characteristic of noncompetitive inhibition?

Accepted Answer

Inhibitor binding can be overcome by increasing substrate concentration.

Question 19

A patient is treated with a drug that acts as a competitive inhibitor. Which of the following is the best strategy to overcome the inhibition?

Accepted Answer

Increase the concentration of the substrate.

Question 20

Which of the following best describes the effect of an uncompetitive inhibitor on enzyme kinetics?

Accepted Answer

$V_	ext{max}$ and $K_m$ both decrease

Enzyme Kinetics: Reversible Inhibition

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