Allosteric Effects
An allosteric activator

decreases the binding affinity
both (a) and (c)
stabilizes the R state of the protein
increases the binding affinity

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

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

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