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Allosteric Effects

Allosteric Effects
When protein binds two ligands in a non-cooperative manner, then the x-intercept of the Scatchard Plot is

2
not defined
None of these
1

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Allosteric Effects
Small molecules affect hemoglobin (Hb) by

increasing Hb affinity for O2
increasing [H+]
increasing [H+] and decreasing Hb affinity for O2
decreasing Hb affinity for O2

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Allosteric Effects
An allosteric activator

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

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

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

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Allosteric Effects
The Hill coefficient (nH) for myoglobin and hemoglobin are respectively

1.0 and 2.8
4.5 and 1.2
2.8 and 1.0
1.2 and 4.5

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Allosteric Effects
The specificity of a ligand binding site on a protein is based on

the amino acid residues lining the binding site
the presence of hydrating water molecules
the opposite chirality of the binding ligand
the absence of competing ligands

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