#Question id: 2199
#Unit 2. Cellular Organization
Which of the following is not an example of an ion transporter?
#Question id: 2200
#Unit 2. Cellular Organization
A neurotransmitter that binds to a postsynaptic cell and opens K+ channels:
#Question id: 2201
#Unit 2. Cellular Organization
Much of what we know about the nicotinic acetylcholine receptor has come from studies of:
#Question id: 2202
#Unit 2. Cellular Organization
The distribution of K+ across an artificial membrane was measured, and the concentrations were found to be equal on both sides. Which of the following statements is true about the distribution of K+?
#Question id: 2203
#Unit 2. Cellular Organization
Parietal cells acidify the stomach contents while maintaining a neutral cytosolic pH by:
a. exporting “excess” cytosolic OH– as HCO3–.
b. exchanging HCO3– for Cl–.
c. preserving electroneutrality by accompanying the movement of each Cl– ion into the stomach lumen by a K+.
d. the excess K+ ions pumped inward by the H+/K+ ATPase are returned to the stomach lumen, thus maintaining the normal intracellular K+ concentration.
Which of the following combination is correct?
#Question id: 2204
#Unit 2. Cellular Organization
A mutant channel protein is expressed in an oocyte. Compared to patch clamping experiments in oocytes expressing the normal channel, the length of downward deviations is diminished by half. This indicates: