Transport Mechanisms USCA Questions Set #1
Type A Multiple Choice: Select one answer.
1. Arrange the following in order of decreasing cell membrane permeability.
a) Oxygen > urea > glycerol > fibrinogen (plasma protein).
b) Oxygen > glycerol > urea > fibrinogen.
c) Urea > fibrinogen > oxygen > glycerol.
d) Fibrinogen > glycerol > urea > oxygen.
e) None of the above.
2. Which of the following is NOT a function of membrane proteins?
a) Act as enzymes to catalyze membrane associated reactions.
b) Surface markers to identify cells.
c) Increase bilayer fluidity.
d) Cell‐cell adhesion.
e) All of the above are membrane protein functions.
3. Calcium ion channels allow for the movement of calcium ions down their concentration
gradient _________ the cell. The amino acids lining the inner domain of the channel (forming
the pore) are mostly ________.
a) out of, hydrophilic
b) out of, hydrophobic
c) out of, neutral
c) into, hydrophilic
d) into, hydrophobic
4. A scientist at McGill recently discovered a new carrier that mediates the transport of the
amino acid cysteine into cells. Which of the following curves best represents the flux of cysteine
as a function of the extracellular solute concentration?
e) All of the curves are inaccurate
Type B: Select a combination of answers a