Course

Cell Biology

Study Pack

Set 8 Transport Across Membranes Overcoming The Permeability Barrier

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Question 1

(Multiple Choice)

Free
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.

Answer

Question 2

(Multiple Choice)

Free
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.

Answer

Question 3

(Multiple Choice)

Free
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.

Answer