24. Two proteins bind to the same ligand, and protein A has half of it s binding

Question

24. Two proteins bind to the same ligand, and protein A has half of it s binding sites occupied when the ligand concentration is 0.5 mM, while protein B has hal concentration is at 0.3 mM. Which protein binds the ligand more strongly, an dissociation constant for that protein-ligand interaction? A) Protein A binds more strongly, and Ka 0.3 mM B) Protein A binds more strongly, and Kd 0.5 mM C) Protein B binds more strongly, and Ki 0.3 mM. D) Protein B binds more strongly, and K 0.5 mM E) Both proteins bind the ligand with the same affinity, and K 0.4 mM. If of its binding sites occupied when the ligand d what i s the 25. The change in hemoglobin-binding affinity for oxygen due to changing pH and CO2 concentration in the blood is known as the: A) Hill hypothesis B) Messelson theory. C) Bohr effect. D) Higgs observation. E) Boyle hypothesis.

Explanation / Answer

24) protein A binds strongly with kd = 0.5 mM

25) The chemical basis for this Bohr effect is due to the formation of two salt bridges of the quaternary structure. so correct answer is (c)

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