Which describes the action of a ligand's competitive antagonist?
A)It decreases the amount of ligand required to activate the protein.
B)It blocks the binding of the ligand to its binding site and prevents activation of the protein.
C)It binds to a different binding site on the protein,altering the protein shape so that a ligand cannot bind.
D)When present,it increases the binding of a ligand to its receptor.

Question

Which describes the action of a ligand's competitive antagonist?
A)It decreases the amount of ligand required to activate the protein.
B)It blocks the binding of the ligand to its binding site and prevents activation of the protein.
C)It binds to a different binding site on the protein,altering the protein shape so that a ligand cannot bind.
D)When present,it increases the binding of a ligand to its receptor.

Quizplus · Accepted Answer

A competitive antagonist binds to the same binding site as the ligand and blocks it from binding, preventing activation of the protein. This means that the amount of ligand required to activate the protein will effectively increase.

Which Describes the Action of a Ligand's Competitive Antagonist