39. G protein is active when: (A) GDP replaces GTP (B) It is bound by its ligand and transported to the nucleus (C) GTP is bound to it (D)It is phosphorylated by protein kinase (E) Ca2+ binds to a protein-linked receptor

39. G protein is active when:
(A) GDP replaces GTP
(B) It is bound by its ligand and transported to the nucleus
(C) GTP is bound to it
(D)It is phosphorylated by protein kinase
(E) Ca2+ binds to a protein-linked receptor

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統計： A(0), B(0), C(0), D(2), E(0) #2789359

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B1 · 2024/01/09

#6004349

G protein is active...

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9. Based on the plot of oxygen saturation versus partial pressure of oxygen, which of the following statenents is true? (A) at oxygen pressure > 100 mm Hg, hemogiobin dissociates into individual subunits so that it is able to bind oxygen similar to myoglobin (B) at typical resting capillary oxygen pressure of ~30 mm Hg, hemoglobin has only 1 of its 4 oxygen binding sites filled while myoglobin is nearly saturated with oxygen (C)under periods of extreme muscle exertion, capillary oxygen pressure can drop to 10 mm Hg, allowing release of ~90% of oxygen carried by hemoglobin (D) the structure of hemoglobin allows for complete release of oxygen in capillary beds at all times (E) none of the above

39. G protein is active when:
(A) GDP replaces GTP
(B) It is bound by its ligand and transported to the nucleus
(C) GTP is bound to it
(D)It is phosphorylated by protein kinase
(E) Ca2+ binds to a protein-linked receptor

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