Exam 3: The Plasma Membrane and Membrane Potential

Which of the following allows a membrane potential to be measured directly by taking into account relative permeabilities and gradients for all permeable ions?

If osmosis is occurring, then you know there is a net movement of water to an area of

A solution containing 300 mOsm/L will always gain water from a solution containing only 250 mOsm/L.

In the plasma membrane, the polar ends of the phospholipid molecules are hydrophilic.

Opening a gated channel that allows Na⁺ to diffuse through the plasma membrane would cause the membrane potential to increase.

Which of the following would not require a carrier?

Osmosis does not occur if there is no concentration gradients for water and solutes on opposite sides of a semipermeable membrane.

Some cell adhesion molecules are peripheral proteins and some are integral proteins.

Solution 1 has two solutes (A and B) and an osmotic pressure of 250 mOsm.Solution 2 has only one solute (C) and an osmotic pressure of 300 mOsm.If a membrane between these solutions is permeable to only water and B, then

The following questions refer to comparative concentrations, permeabilities, and potentials under various circumstances.Indicate the relationship between the two items listed in each situation using the following answer code. a.A is greater than B b.B is greater than A c.A and B are equal -a.resting potential in a nerve cell B.equilibrium potential for K⁺

According to the fluid mosaic model, the plasma membrane consists primarily of a bilayer of mobile phospholipid molecules studded with an ever-changing mosaic pattern of proteins.

If a cell begins to swell after being placed into a salt solution, the salt solution must have a lower osmotic pressure than the cytosol.

Oxygen gas, cholesterol, and glucose molecules are lipid-soluble, whereas proteins, amino acids, and ions are water-soluble.

The SGLT and GLUT carriers do not split ATP.

Receptor sites on the outer surface of the plasma membrane are made of

Use the figure above to answer the corresponding questions. -Which protein could represent the GLUT protein in the membrane of an intestinal cell? a.1 b.2 c.3 d.4 e.5

Indicate the various roles of the following ions using the answer in the column below. a.Na+ b.K+ c.A- d.Cl- -Anion in greatest concentration in the ECF

In cystic fibrosis, defective chloride channels allow too many chloride ions to enter the cell, causing the cell to become hypertonic to the ECF and swell.

Select the substance that promotes cell adhesion.

Indicate the various roles of the following ions using the answer in the column below. a.Na+ b.K+ c.A- d.Cl- -Cation to which the membrane is most permeable under resting conditions