Exam 4: Cell Membrane Transport

The concentration of an anion inside a cell is 0.3%. The concentration of this anion outside the cell is 0.1%. How could the cell obtain more of this ion inside the cell?

With a concentration of 10 mM glucose and 5 mM K+ on the outside of the membrane and 1 mM glucose and 140 mM K+ on the inside, the glucose would move (into/out of)the cells if the membrane is permeable to glucose.

Pumps can move ions in either direction, as long as it is moving against that ion's electrochemical gradient.

During cotransport with sodium ions, glucose is (actively/passively)transported into the cell by the concentration gradient established through the Na+/K+ pump.

Na+ is released from its binding site on the Na+/ K+ pump as a result of the

Epithelial cells are polarized with different structures at either end of the cell. The portion of the membrane that faces the lumen is called the membrane.

The unequal distribution of charge in solutions on either side of a membrane will lead to a of charge across the membrane and a of counter ions in a region close to the membrane.

If solution 1 (0.1 M glucose and 0.15 M NaCl)and solution 2 (0.4 M glucose)are separated by a membrane, then solution 1 is relative to solution 2.

When molecules are passively transported across a membrane, the direction of their movement is dictated by the molecule's tendency to move

Secretory vesicles are a part of what transport mechanism?

As the molecular weight of a molecule increases, its

Osmosis occurs through aquaporins.

Which of the following is NOT a determinant of the magnitude and direction of the equilibrium potential for an ion?

Describe the chemical and electrical driving forces that move ions across a membrane.

During phagocytosis, the phagosome binds with a(n)to form a(n).

Which of the following transport mechanisms is passive?

If the membrane potential is equal to the equilibrium potential for an ion, individual ions will NOT move across the membrane in either direction.

Which ion(s)have a net chemical force acting to move the ion(s)into the cell? (Assume a resting membrane potential (Vm)of - 70mV.)

In the presence of two or more ions, it is the sum of their concentration that determines the direction of movement of those ions across a membrane.

Most water molecules that cross the plasma membrane do so by