Exam 3: The Plasma Membrane and Membrane Potential

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.amount of Na⁺ transported out of the cell B.amount of K⁺ transported into the cell

Which statement is false?

In facilitated diffusion, particles move from a(n) ____________________ concentration to a(n) ____________________ concentration.

The resting membrane potential of a typical nerve cell is ____ mV.

Indicate whether the force in question tends to move the involved ion into or out of the cell by filling in the blank using the following code. a.tends to move the ion into the cell b.tends to move out of the cell -Electrical gradient for Na⁺ at resting potential

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.concentration gradient for K⁺ at EK₊ B.electrical gradient for K⁺ at EK₊

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 ICF

According to the Nernst equation, the equilibrium potential for a given ion decreases as the difference in concentration of the ion outside and inside the cell increases.

Indicate the various roles of the following ions using the answer in the column below. a.Na+ b.K+ c.A- d.Cl- -Ion whose equilibrium potential is opposite in charge of the resting membrane potential

Match the term to the correct description. a.collagen b.elastin c.fibronectin d.keratin -Serves as carriers to transport particles across the membrane

With secondary active transport, the movement of

Use the figure above to answer the corresponding questions. -Which protein might be an ATPase? a.1 b.2 c.3 d.4 e.5

Use the figure above to answer the corresponding questions.Assume the membrane is always permeable to water. -In beaker 2, the solution on the right side of the membrane a.has a higher osmolarity than the solution on the left side of the membrane b.will gain water from the solution on the left side of the membrane c.has a lower osmotic pressure than the solution on the left side of the membrane d.has a higher osmolarity than the solution on the left side of the membrane and will gain water from the solution on the left side of the membrane e.none of these

Cadherins are docking-marker acceptors to which secretory vesicles bind prior to exocytosis.

Placing pure water around cells causes the cells to swell because the cytosol has a lower osmotic pressure than the pure water.

Match the term to the correct description. a.collagen b.elastin c.fibronectin d.keratin -Extracellular protein promoting cell adhesion

The rate of diffusion for water-soluble substances through a membrane decreases as

Which statement about gap junctions is incorrect?

Which of the following is most closely related to transcellular transport?

A calcium pump is a secondary active transporter.