Which of the following is not true of phospholipid bilayers?
a. membrane budding requires transient breakages in the bilayer membrane.
b. the interior of phospholipid bilayers is a highly hydrophobic environment.
c. the chemical properties of phospholipids lead to the spontaneous formation of bilayers.
d. phospholipid bilayers separate the cell from the exterior environment as well as from compartments within the cell.

The correct answer is a. Membrane budding requires transient breakages in the bilayer membrane.

Explanation:

In the budding process of the membrane there are no breakages because the lipid membrane is so flexible that they start making the new bud and don't have to add or quit any phospholipid, and then when the process is done lipids separate and the membrane comes to the original assembly and the new bud is formed.

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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