Where is the G-protein complex when a regulatory molecule is not bound to its receptor?
A. The three subunits are together but not attached to the inner surface of the receptor.
B. The beta and gamma subunits are attached to the inner surface of the receptor.
C. The three subunits are together AND attached to the inner surface of the receptor.
D. The alpha subunit is attached to the inner surface of the receptor.
Answer: C
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In the salamander, the sour taste receptor cells function by having an apically localized K+ channel that is blocked by protons. When protons are applied, what happens to the membrane potential and why?
A) Receptor depolarization because K+ permeability, which normally maintains a hyperpolarized resting state is reduced. B) Receptor hyperpolarization because H+ ions move into the cell and render it more positively charged. C) Receptor hyperpolarization because the H+ ions outside the cell make the inside of the cell more negatively charged. D) Nothing will happen until the G-protein is activated.
Demand for veterinarians with specialties continues to increase, especially in metropolitan areas
Indicate whether the statement is true or false
An increase in alveolar O2 concentration caused by a mismatched large airflow and small blood flow brings about pulmonary vasodilation
a. True b. False Indicate whether the statement is true or false
The dicrotic notch in the aortic pressure curve is due to the
A. increase in intraventricular pressure during ejection. B. backflow of blood toward the ventricles. C. closure of the left AV valve. D. elasticity of the arterial wall. E. closure of the semilunar valves.