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Lab Quiz
Cell Transport Mechanisms and Permeability
Lab Quiz
This activity contains 20 questions.
Differential permeability can also be described as:
the allowance of all substances to pass through a membrane without hindrance.
the allowance of only certain substances to pass through a membrane without hindrance.
a membrane's ability to keep nutrients outside of the cell.
a membrane's ability to keep wastes inside the cell.
Passive transport includes which of the following processes?
Osmosis
Bulk-phase endocytosis
Phagocytosis
Pinocytosis
Refer to Activity 1: Simulating Dialysis (Simple Diffusion). Which of the following passed through the 20 MWCO membrane?
Water
Albumin
Na
+
Glucose
Na
+
and water
Refer to Activity 1. Which solute(s) passed through the 100 MWCO membrane?
Glucose
Glucose and sodium
Albumin
Na
+
and urea
Refer to Activity 1. Which solute demonstrated the highest diffusion rate through the 100 MWCO?
The Na
+
and urea diffused at the same rate.
Na
+
Glucose
Albumin
All substances diffused at the same rate.
Urea
Refer to Activity 2: Simulating Facilitated Diffusion. Which solute(s) were able to travel against their concentration gradients?
Urea
None could travel against their concentration gradient.
Glucose
Na
+
Albumin
Refer to Activity 2. One way that the rate of glucose transport could be increased is:
Increase the volume of water
Increase the concentration of glucose
Decrease the concentration of the other solutes
Decrease the MWCO of the membrane
Decrease the number of glucose carriers
Refer to Activity 2. Which of the other solutes affected the rate of glucose diffusion?
Urea
None of the solutes affected the diffusion rate of glucose.
Na
+
Albumin
Refer to Activity 3: Simulating Osmotic Pressure. Under which type of transport process is osmosis included?
Pinocytosis
Bulk-phase endocytosis
Carrier-mediated transport
Facilitated diffusion
Simple diffusion
Refer to Activity 3. Which of the membranes excluded water movement through the membrane?
50 MWCO
20 MWCO
100 MWCO
None of the membranes affected water transport.
200 MWCO
Refer to Activity 3. When solute concentration is __________, then osmotic pressure is __________.
increased, remains the same
decreased, decreased
decreased, increased
increased, increased
increased, decreased
Refer to Activity 4: Simulating Filtration. The simulated filtration membrane is representative of the filtration membrane of what structure in humans?
Collecting tubules
Proximal convoluted tubule
Renal corpuscle
Küpffer cells
Loop of Henle
Distal convoluted tubule
Refer to Activity 4. What characteristic of a solute determines whether or not it passes through a filtration membrane?
pH of the solute
Lipid solubility
Molecular size
Molecular charge
Presence of carrier molecules
Refer to Activity 5: Simulating Active Transport. Which carrier proteins affect Na
+
transport?
Glucose
Albumin
None of the carrier proteins included in this active transport simulation affected Na
+
transport.
Urea
Refer to Activity 5. The ratio of Na
+
to K
+
transport is ____ Na
+
transported out of the cell for every ____ K
+
transported into the cell.
2, 4
2, 1
3, 2
4, 1
2, 3
What characteristic(s) of the semipermeable membrane used in the simple diffusion and filtration experiments determines which substances pass through them?
Molecular weight
Presence of ATP
Presence of carriers
Lipid solubility
All the characteristics are equally important
The left beaker contains 4 mM NaCl, 9 mM glucose and 10 mM albumin. The right beaker contains 10 mM NaCl, 10 mM glucose and 40 mM albumin. The dialysis membrane is permeable to all substances except albumin. In which direction will glucose move?
To the right beaker
To the left beaker
To both beakers
The glucose will not move.
The left beaker contains 4 mM NaCl, 9 mM glucose and 10 mM albumin. The right beaker contains 10 mM NaCl, 10 mM glucose and 40 mM albumin. The dialysis membrane is permeable to all substances except albumin. In which direction will water move?
To the right beaker
To the left beaker
To both beakers
Will not move
When food is pickled for human consumption, as much water as possible is removed from the food. What method is used to achieve this dehydrating effect?
Facilitated diffusion
Simple diffusion
Pinocytosis
Osmosis
Bulk-phase endocytosis
What determines whether a transport process is passive or active?
The cell type
Presence of ATP
Concentration gradients
Membrane permeability
pH
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