Exam 8: Transport Across Membranes: Overcoming the Permeability Barrier

Binding and hydrolysis of ATP in a "cassette" domain is part of the transport mechanism of which of the following types of transporters?

Uptake of food particles by trapping them within an invagination of the plasma membrane is called ________.

Osmosis requires a ________ membrane that is ________ to solute molecules and permeable to water molecules.

Which of the following is a characteristic of facilitated diffusion (passive transport)of a molecule across a membrane?

Water moves across the plasma membrane into or out of a cell by osmosis when

Each of the following molecules move across membranes by simple diffusion except

The Na⁺/K⁺ ATPase pump actively moves

Most cells have a negative plasma membrane potential (Vm)because they have

One way in which ions are specifically transported into the cell is via

Which of the following types of ATPase pumps are sensitive to vanadate (which inhibits phosphorylation of the pump during its activity mechanism)?

Transmembrane movement of a substance up a concentration gradient requires ________ transport.

Knowing the ion concentrations on both sides of the plasma membrane makes it possible to calculate the membrane potential (Vm),because at equilibrium

Why would some cells,such as erythrocytes,express GLUT1,but other cells,such as liver cells,express GLUT2,which has a different kinetic relationship between v (rate of diffusion)and Δ[S] (solute concentration gradient)?

All of the following are true about a partition coefficient except

Each of the following is true for the mechanism of the Na⁺/K⁺ ATPase pump except

Explain why the steroid hormone estradiol (MW 272)readily crosses membranes by simple diffusion but the much smaller H⁺ requires transport proteins.

Which of the following protein types would you predict is defective in kidney water balance disorders?

When erythrocytes are in the capillaries of the lungs,O₂ diffuses ________ and is bound to ________.

Which of the following glucose transporters has properties that facilitate glucose transport out of human liver cells to maintain blood sugar level homeostasis?

Ion gradients established across membranes by V-type ATPase pumps range from