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Cotransport (Symport and Antiport)

View the animation below, then complete the quiz to test your knowledge of the concept.






1Sugars can be transported into cells against their concentration gradient because of
A)osmosis.
B)simple diffusion.
C)facilitated diffusion.
D)antiport with Na+.
E)symport with Na +.



2Which of the following is an example of antiport?
A)simultaneous movement of an amino acid and protons into the cell
B)simultaneous movement of an amino acid and protons out of the cell
C)coupling of the inward movement of water with the outward movement of protons
D)coupling of the inward movement of Na+ with the outward movement of Ca ++
E)none of the above.



3Which of the following is the most direct source of energy for cotransport?
A)the movement of one of the transported substances up its concentration gradient
B)the movement of one of the transported substances down its concentration gradient
C)ATP hydrolysis
D)ATP formation
E)cotransport requires no energy



4The sodium-potassium pump maintains a high sodium ion concentration in the cell.
A)True
B)False



5Both symport and antiport require transport proteins.
A)True
B)False







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