1. On average, the resting membrane potential is -70mV. What does the sign and m
ID: 3515231 • Letter: 1
Question
1. On average, the resting membrane potential is -70mV. What does the sign and magnitude of this value tell you?
A. The outside surface of the plasma membrane is much more negatively charged than the inside surface.
B. The inside surface of the plasma membrane is much more positively charged than the outside surface.
C. There is no electrical potential difference between the inside and the outside surfaces of the plasma membrane.
D. The inside surface of the plasma membrane is much more negatively charged than the outside surface.
2. Which description of synapses is NOT correct?
A. Second messengers can activate gene activities in the postsynaptic neuron.
B. Excitatory synapses cause depolarization.
C. Lonotropic receptors are ion channels that open and influence the polarization of the mebrane.
D. Direct signalizing involves the activation of G Proteins.
Explanation / Answer
1. D
Resting potential difference between the inside and outside of the cell. The numeric value is generally negative, meaning that the inside of the cell is negative with respect to the outside.
2. D
Synapse is a structure that permits a neuron to pass an electrical or chemical to another neuron or to the target efferent cell. Direct signalizing doesn't involve the activation of G proteins. In direct signalizing electric pulse passes through GAP JUNCTIONS, causing voltage changes in the presynaptic cell to induce voltage changes in the postsynaptic cell.
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