If conditions were found in which \alpha -subunits of hemoglobin existed as monomers, then a trace of fractional saturation as a function of the partial pressure of oxygen would likely appear hyperbolic in the case of these monomeric \alpha -subunits. Group of answer choices The statement is accurate. The statement is inaccurate.
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Under appropriate conditions, hemoglobin dissociates into its four subunits. The isolated alfa subunit binds oxygen, but the O2-saturation curve is hyperbolic rather that sigmoid. In addition, the binding of oxygen to the isolated alfa subunit is not affected by the presence of H+, CO2 or 2,3-BPG. What do these observations indicate about the source of the cooperativity in hemoglobin?
Sri K.
Under appropriate conditions, hemoglobin dissociates into its four subunits. The isolated $\alpha$ subunit binds oxygen, but the O_2-saturation curve is hyperbolic rather than sigmoid. In addition, the binding of oxygen to the isolated $a$ subunit is not affected by the presence of $\mathrm{H}^{+}, \mathrm{CO}_{2}$, or BPG. What do these observations indicate about the source of the cooperativity in hemoglobin?
Questions $33-34$ The following questions refer to this graph that shows the rate at which relative amounts of oxygen bound to hemoglobin change as the partial pressure of oxygen changes. Based on this graph, which of the following statements is true? (A) At oxygen concentration 40 $\mathrm{mm}$ Hg, hemoglobin $\mathrm{A}$ is 40$\%$ saturated with oxygen, while hemoglobin $\mathrm{B}$ is at 20$\%$ (B) At oxygen concentration 60 $\mathrm{mm}$ Hg, hemoglobin $\mathrm{B}$ is 100$\%$ saturated with oxygen. (C) Hemoglobin A becomes 100$\%$ saturated with oxygen at 60 $\mathrm{mm} \mathrm{Hg} .$ (D) Hemoglobins A and B become saturated with oxygen at the same concentration of $\mathrm{O}_{2}$ . (E) Neither hemoglobin A nor hemogin $\mathrm{B}$ ever becomes 100$\%$ saturated with oxygen.
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Biology E/M Sample Test 2
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