Chapter 8 Cell Phys Beckers World of the Cell 9th ed
1. Each of the following molecules move across membranes by simple
diffusion except A) oxygen.
B) fatty acids.
C) water.
D) glucose.
E) carbon dioxide: D
2. One way in which ions are specifically transported into the cell is via
A) gated channels.
B) simple diffusion.
C) carrier (permease) proteins.
D) uniport transporters.
E) ABC transporters.: A
3. Phosphorylation of glucose following its transport into a cell
A) targets the glucose for transport back out of the cell.
B) decreases glucose transport into the cell by decreasing its concentration
gradient across the plasma membrane.
C) increases glucose transport into the cell by increasing its concentration
gradient across the plasma membrane.
D) converts glucose into a form that can more easily be exported from the
cell.
E) maintains a higher level of glucose outside the cell.: C
4. Bacterial porins transport
A) any hydrophilic molecule regardless of size.
B) hydrophilic molecules smaller than 600 Da.
C) any hydrophobic molecule regardless of size.
D) hydrophobic molecules larger than 600 Da.
E) any molecule regardless of properties or size.: B
5. Which of the following protein types would you predict is defective in
kidney water balance disorders?
A) aquaporin
, Chapter 8 Cell Phys Beckers World of the Cell 9th ed
B) porin
C) class ATPase
D) anion exchange protein
E) GLUT: A
6. Most cells have a negative plasma membrane potential (Vm) because they
have
A) equal concentrations of ions on both sides of the membrane.
B) an excess of negatively charged solute molecules inside the cell.
C) an excess of positively charged solute molecules inside the cell.
D) an excess of negatively charged solute molecules outside the cell.
E) an excess of water molecules inside the cell.: B
7. Water moves across the plasma membrane into or out of a cell by
osmosis when
A) there is an equal solute concentration on both sides of the membrane.
B) water diffuses through a semipermeable membrane toward a higher
solute concentration.
C) water diffuses through a semipermeable membrane toward a lower solute
concentration.
D) a high solute concentration opens an aquaporin channel.
E) ATP hydrolysis drives aquaporin transport.: B
8. All of the following are true about a partition coefficient except
A) it is the ratio of solubility in an organic solvent to solubility in water.
B) it can be used to predict the probability that an amino acid is part of a
transmembrane region of a protein.
C) it is high for a molecule that readily crosses membranes by simple diffu-
sion.
D) it is the concentration at which the rate of transport is half maximal.
E) it depends on the polarity of the molecule.: D
9. Which of the following types of transport occur across the erythrocyte
membrane?
A) O2 and CO2 passive diffusion
1. Each of the following molecules move across membranes by simple
diffusion except A) oxygen.
B) fatty acids.
C) water.
D) glucose.
E) carbon dioxide: D
2. One way in which ions are specifically transported into the cell is via
A) gated channels.
B) simple diffusion.
C) carrier (permease) proteins.
D) uniport transporters.
E) ABC transporters.: A
3. Phosphorylation of glucose following its transport into a cell
A) targets the glucose for transport back out of the cell.
B) decreases glucose transport into the cell by decreasing its concentration
gradient across the plasma membrane.
C) increases glucose transport into the cell by increasing its concentration
gradient across the plasma membrane.
D) converts glucose into a form that can more easily be exported from the
cell.
E) maintains a higher level of glucose outside the cell.: C
4. Bacterial porins transport
A) any hydrophilic molecule regardless of size.
B) hydrophilic molecules smaller than 600 Da.
C) any hydrophobic molecule regardless of size.
D) hydrophobic molecules larger than 600 Da.
E) any molecule regardless of properties or size.: B
5. Which of the following protein types would you predict is defective in
kidney water balance disorders?
A) aquaporin
, Chapter 8 Cell Phys Beckers World of the Cell 9th ed
B) porin
C) class ATPase
D) anion exchange protein
E) GLUT: A
6. Most cells have a negative plasma membrane potential (Vm) because they
have
A) equal concentrations of ions on both sides of the membrane.
B) an excess of negatively charged solute molecules inside the cell.
C) an excess of positively charged solute molecules inside the cell.
D) an excess of negatively charged solute molecules outside the cell.
E) an excess of water molecules inside the cell.: B
7. Water moves across the plasma membrane into or out of a cell by
osmosis when
A) there is an equal solute concentration on both sides of the membrane.
B) water diffuses through a semipermeable membrane toward a higher
solute concentration.
C) water diffuses through a semipermeable membrane toward a lower solute
concentration.
D) a high solute concentration opens an aquaporin channel.
E) ATP hydrolysis drives aquaporin transport.: B
8. All of the following are true about a partition coefficient except
A) it is the ratio of solubility in an organic solvent to solubility in water.
B) it can be used to predict the probability that an amino acid is part of a
transmembrane region of a protein.
C) it is high for a molecule that readily crosses membranes by simple diffu-
sion.
D) it is the concentration at which the rate of transport is half maximal.
E) it depends on the polarity of the molecule.: D
9. Which of the following types of transport occur across the erythrocyte
membrane?
A) O2 and CO2 passive diffusion
