Exam 3: The Plasma Membrane and Membrane Potential

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 concentration gradient is established by the membrane potential

____________________ are cell-to-cell connections through which materials can pass from the cytosol of one cell into the cytosol of an adjacent cell.

Use the figure above to answer the corresponding questions. -Describe the concentration gradients associated with the resting 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 -Concentration gradient for K⁺ at resting potential

Fibronectin is a strong carbohydrate in the extracellular matrix of connective tissues that holds adjacent cells together.

A Ca²⁺ pump in the plasma membrane

Match the term to the correct description. a.collagen b.elastin c.fibronectin d.keratin -Forms channels through the membrane

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.could eventually have the same number of red solute particles as the solution on the left side of the membrane b.could eventually have the same concentration of red particles as the solution on the left side of the membrane c.currently has a higher osmotic pressure than the solution on the left side of the membrane d.is currently gaining water e.all of these

Which of the following is not a function of membrane proteins?

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 into the cell

The dark lines in the trilaminar appearance of the plasma membrane are likely caused by the preferential staining of the hydrophobic, nonpolar regions of the membrane constituents.

A solution having a lower osmolarity will always gain water from a solution having a higher osmolarity.

Because a solution of lower solute concentration has a higher concentration of water, it exerts a lower osmotic pressure than does a solution with a higher solute concentration.

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 -In the presence of substance Z there is a decreased rate of entry of substance X.

In active transport, a substance moves from an area of ____________________ concentration to an area of ____________________ concentration.

The SGLT carrier transports ______________ molecules against their concentration gradient while moving _____________ ions down their concentration gradient.

Use the figure above to answer the corresponding questions. -Describe the action of a Na⁺-K⁺ pump.

____________________ is a rubber-like protein found in tissues of organs such as the lungs.

Which of the following cannot pass through a plasma membrane by primary active transport?

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 greater than the resting membrane potential