Allosteric Effects
A protein that shows infinite cooperative for binding of n ligands will

show a Hill coefficient (nH) of n
show a Hill coefficient (nH) of 0.0
both (b) and (c)
only be found in either the unliganded form or the fully liganded form

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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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Allosteric Effects
The conformational changes from the T to the R state is initiated by

movement of the proximal histidine towards the heme
reorganization of protein-protein contacts between the individual subunits
binding of oxygen to the heme
movement of the F-helix, which contains the proximal His

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