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Test Bank for Chapter 8 Cell Phys Beckers World of the Cell 9th ed (10th Edition by Jeff Hardin)
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Test Bank for Chapter 8 Cell PhysBeckers World of the Cell 9th ed (10th
Edition by Jeff Hardin)
Each of the following molecules move across membranes by simple diffusion except
A) oxygen.
B) fatty acids.
C) water.
D) glucose.
E) carbon dioxide - ANSD
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. - ANSA
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. - ANSC
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. - ANSB
Which of the following protein types would you predict is defective in kidney water balance
disorders?
A) aquaporin
B) porin
C) class ATPase
, D) anion exchange protein
E) GLUT - ANSA
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. - ANSB
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. - ANSB
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 diffusion.
D) it is the concentration at which the rate of transport is half maximal.
E) it depends on the polarity of the molecule. - ANSD
Which of the following types of transport occur across the erythrocyte membrane?
A) O2 and CO2 passive diffusion
B) aquaporin water transport
C) Cl− bicarbonate ion antiport
D) glucose uniport
E) All of the above are correct. - ANSE
Because the procedure you are using to modify plants requires their cell membranes to be
pulled away from the cell walls by plasmolysis, you place the cells in a(n)
A) acid solution.
B) hypotonic solution.
C) isotonic solution.
D) basic solution.
E) hypertonic solution - ANSE
Knowing the ion concentrations on both sides of the plasma membrane makes it possible to
calculate the membrane potential (Vm), because at equilibrium
A) the Faraday constant is 0.
B) ΔG is 1.
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