Exam 3: The Plasma Membrane and Membrane Potential

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 ENₐ⁺

If a human cell is placed into solution X, containing water and a nonpenetrating solute, then

Indicate the various roles of the following ions using the answer in the column below. a.Na+ b.K+ c.A- d.Cl- -Ion that has the predominant influence on the resting membrane potential

Use the figure above to answer the corresponding questions. -Which protein might require ATP in order to transport a particle through the membrane? a.1 b.2 c.3 d.4 e.5

Selective permeability of the membrane is primarily determined by

The GLUT carrier moves glucose molecules ____________________ their concentration gradient while the SGLT carrier moves glucose _________________their concentration gradient.

Identify the true statement(s) about the plasma membrane.

Na⁺ ions can move from the ECF into the ICF by passing through secondary active transport carriers, simple diffusion channels, and the sodium-potassium pumps.

Which one of the following requires the cell to expend energy?

Under an electron microscope, the plasma membrane appears as a trilaminar structure consisting of two light layers separated by a dark middle layer.

Match the term to the correct description. a.collagen b.elastin c.fibronectin d.keratin -Determines the degree of fluidity of the membrane

Match the term to the correct description. a.collagen b.elastin c.fibronectin d.keratin -Intracellular protein that supports desmosomes

Indicate which characteristic of a mediated-transport system is referred to in each item by filling in the blank using the following answer code. a.specificity b.saturation c.competition -Carrier can handle substance X but not substance Y.

If solution A has a higher concentration of solute particles than solution B and if these solutions are separated by a semipermeable membrane, then there will be a net movement of water

Facilitated diffusion

Which statement about movement into the cytosol is false?

Use the figure above to answer the corresponding questions. -Which step will come immediately after the carrier releases the ions shown in this figure? a.The carrier will become phosphorylated. b.The carrier will pick up ions from the ECF. c.The carrier will pick up ions from the ICF. d.The carrier will split ATP. e.The carrier will become phosphorylated and The carrier will split ATP.

Match the term to the correct description. a.collagen b.elastin c.fibronectin d.keratin -Serves as membrane-bound enzymes

Indicate the various roles of the following ions using the answer in the column below. a.Na+ b.K+ c.A- d.Cl- -Ion that is actively transported out of the cell

Cell connections called ____________________ force materials to pass through cells and not between them.