Allosteric Effects
A protein that binds two ligands in a non-cooperative manner will show

a hyperbolic binding curve
both (b) and (c)
a sigmodial binding curve
a linear Scatchard Plot

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Allosteric Effects
Bisphosphoglycerate (BPG) cannot bind to the oxygenated R state of hemoglobin because

BPG binds to the R state with the same affinity as the T state
it is displaced from the heme by oxygen
its binding pocket becomes too small to accommodate BPG
it is displaced from the heme by movement of the proximal histidine

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