Passive, Facilitated and Active Transport Flashcards
Which of these is not a characteristic of Passive transport?
A. Molecule will go with its concentration gradient
B. Involves channel or carrier proteins
C. Requires energy
D. None of the above
C. Requires Energy
Passive Transport does not involve energy because it is not bringing a molecule against the concentration gradient
Which of these statements is true?
A. Passive transport requires energy to move a molecule across a membrane
B. Active transport moves molecules against the membrane’s concentration gradient
C. Passive transport and simple diffusion are the same
D. Active Transport does not require energy
B. Active transport moves molecules against the membrane’s concentration gradient
Active transport does require energy, either in the form of hydrolysis or ATP energy.
How do carrier proteins mediate passive transport?
Conformational changes
Carrier proteins move solutes from a high concentration from outside of the cell to inside of the cell through a conformational change
What are the kinetics of simple diffusion?
rate of transport is proportional to concentration of molecule being transported
What are the kinetics of transport mediated diffusion?
Rate of transport reaches a maximum when transport protein is saturated. The 1/2Vmax and Km for carrier mediated is similar to those values for enzyme:substrate kinetics
What are the three ways to drive transport?
Coupled
ATP-Driven
Light-driven pumps
Coupled transport is best described as
A. Transport of one molecule against a concentration gradient is coupled to another molecule being transported down its concentration gradient
B. Involves energy derived from ATP hydrolysis to move a molecule against its concentration gradient
C. found in bacteria use energy from light
D. None of the above
A. Transport of one molecule against a concentration gradient is coupled to another molecule being transported down its concentration gradient
What is ATP-Driven Transport?
Involves energy derived from ATP hydrolysis to move a molecule against its concentration gradient
What are light driven pumps?
found in bacteria use energy from light
What are the three types of carrier-mediated transport?
Uniport
Symport
Antiport
True or False: A coupled transport can also be a carrier-mediated transport.
True
What kind of transport is the Glucose carrier in the gut?
Active Coupled Symport Transport
The glucose carrier in the gut oscillates between 2 states (A and B). Na+ and glucose travel from the extracellular matrix to the cytosol through symport transportation. When both Na+ and glucose bind to the glucose carrier, they induce a conformation change that results in the release of glucose and Na+ into the cytosol
How does glucose get transported from the intestinal lumen to the extracellular fluid?
Glucose and Na+ are symport transported through the glucose carrier protein. The glucose then travels to the carrier protein mediating passive transport into the extracellular fluid. The Na+ is antiport transported with K+ through the Na-K pump into the extracellular matrix
Which of these molecules has the highest extracellular concentration? A. Na+ B. K+ C. Ca 2+ D. Cl-
A. Na+
Which of these molecules has the highest intracellular concentration? A. Na+ B. K+ C. Ca 2+ D. H+
B. K+
