Tadalafil (Cialis) Is a Competitive Inhibitor of Phosphodiesterase Type 5

question 17

Multiple Choice

Tadalafil (Cialis) is a competitive inhibitor of phosphodiesterase type 5.As a competitive inhibitor, you can expect tadalafil to:

• A)Covalently modify the enzyme.
• B)Bind to allosteric sites on the enzyme.
• C)Lower the Vmax of the reaction.
• D)Increase the Km of the enzyme for the substrate.
• E)Reduce the free energy of activation for the reaction.

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