Which of the following is not a function of membrane proteins?
Some act as channels.
They determine the fluidity of the membrane.
Some will transport glucose.
They include docking-marker acceptors.
Some act as enzymes.
Identify the incorrect statement about the plasma membrane.
Cholesterol contributes to its stability.
Its lipids may surround CAMs.
Its primary components are glycoproteins and cholesterol.
Its lipid bilayer is flexible.
Its glycocalyx is in contact with ECF.
The rate at which "X" can diffuse through a plasma membrane is inversely proportional to the
lipid solubility of X
concentration gradient for X
molecular weight of X
membrane's surface area
lipid solubility and molecular weight of X
Which statement about gap junctions is incorrect?
They consist of protein.
They are anchored to plaques on the inside surface of the plasma membrane.
They allow materials to pass from one cell into an adjacent cell.
They play a role in transmitting electrical activity through the heart.
They consist of connexons.
Selective permeability of the membrane is primarily determined by
page1image18864 a. membrane phospholipids
b. how much cholesterol is present
c. the number and type of membrane proteins the charge of the membrane
d. none of these
If a typical body cell is placed into a 1% saline solution, the cell will
a. gain more water than it loses.
b. will have a higher osmotic pressure than the ECF.
c. will have a lower hydrostatic pressure than the ECF.
d. will gain and lose water at the same rate.
e. will have a lower osmolarity than the saline solution.

An electrical gradient
favors the movement of K+ out of the cell at resting potential
favors the movement of Na+ into the cell at resting potential
opposes the concentration gradient for Na+ at the equilibrium potential for Na+
favors the movement of Cl- out of the cell at resting potential
prevents the active transport of K+ into the cell
During osmosis,
water moves away from the solution with the higher osmotic pressure.
water moves into a hypotonic solution.
the solute moves against its concentration gradient.
all of the above events would occur.
none of the above events would occur.
Solution 1 has two solutes (A and B) and an osmotic pressure of 250 mOsm. Solution 2 has only one solute (C) and an osmotic pressure of 300 mOsm. If a membrane between these solutions is permeable to only water and B, then
Solution 1 will gain water from solution 2.
Solution 2 will gain water from solution 1.
Some of solute C will move into solution 1.
Solution 1 has a higher osmotic pressure.
Solution 1 would be hypertonic to a human cell.
Which of the following would not require a carrier?
Movement of potassium into the cell
Movement of sodium into the cell
Iodine uptake by thyroid gland cells
Glucose uptake by body cells
None of the above would require a carrier.
With secondary active transport, the movement of
H+ out of a cell by antiport is downhill
amino acids into the cell by symport is uphill
glucose into a cell by cotransport is downhill
H+ is in the same direction as the movement of Na+
glucose is in the opposite direction as the movement of Na+
The rate of carrier-mediated transport is limited by
the glycocalyx
osmolarity
tonicity
competition with other molecules
the number of protein channels present in the membrane
All of the following transport certain substances from regions of high concentration to low concentration except
carriers
facilitated diffusion
SGLT
GLUT
Ca2+ pump
Which pairing has the most closely related items?
a. Tight junction, connexon
page2image27552
Gap junction, cadherin
Tight junction, kiss site
Gap junction, plaque
Desmosome, claudin
Which answer is true about NET water movement between two solutions that are separated by a semipermeable membrane.
a. It will always be toward the solution with the lower osmotic pressure.
b. It might be toward the solution with the lower osmotic pressure.
c. It will always be toward the solution with the lower hydrostatic pressure. d. It might be toward both solutions at the same time.
e. None of the above statements are true.