Protein a Has Four Identical Subunits,each of Which Binds One

Multiple Choice

Protein A has four identical subunits,each of which binds one molecule of ligand Y.The binding of one molecule of Y to one of the subunits induces a conformational change in neighboring subunits that enhances the binding of additional units of Y.This is an example of ________.

A) negative cooperativity
B) competitive activation
C) symmetry-driven binding
D) the sequential theory