Enzyme Kinetics and Inhibition Quiz

What does enzyme kinetics primarily study?

• The temperature stability of enzymes

• The rates of enzyme-catalyzed reactions

• The genetic coding of enzymes

• The structure of enzymes

In a Michaelis-Menten plot, what is represented on the y-axis?

• Inhibitor concentration

• Substrate concentration

• Reaction velocity

• Enzyme concentration

What does Vmax represent in enzyme kinetics?

• The minimum velocity of a reaction

• The maximum velocity of a reaction

• The average velocity of a reaction

• The velocity at zero substrate concentration

Why does the reaction rate not increase beyond Vmax?

• Enzyme concentration is too high

• Substrate concentration is too low

• Temperature is too low

• All enzymes are saturated with substrate

What does Km indicate in enzyme kinetics?

• The substrate concentration at half Vmax

• The maximum velocity of a reaction

• The inhibitor concentration at maximum velocity

• The enzyme concentration at maximum velocity

A low Km value suggests what about the enzyme-substrate affinity?

• Low affinity

• High affinity

• No affinity

• Variable affinity

What happens to the reaction rate when substrate concentration increases?

• It remains constant

• It increases

• It fluctuates

• It decreases

What is the effect of a competitive inhibitor on enzyme activity?

• It binds to a site other than the active site

• It competes with the substrate for the active site

• It decreases Km

• It increases Vmax

How does a non-competitive inhibitor affect an enzyme?

• It increases the enzyme's affinity for the substrate

• It decreases the enzyme's affinity for the substrate

• It reduces the enzyme's ability to catalyze the reaction

• It increases the enzyme's ability to catalyze the reaction

Which of the following is true about Vmax in the presence of a non-competitive inhibitor?

• Vmax decreases

• Vmax increases

• Vmax remains unchanged

• Vmax becomes zero