Which of the following is an example of symport ?
A)H^ + ATPase
B)sodium glucose cotransport
C)sodium potassium ATPase
D)sodium hydrogen exchange
E)osmosis
B) sodium glucose cotransport
The correct answer is B) sodium glucose cotransport.
Symport refers to a type of membrane transport mechanism where two substances are transported across the cell membrane in the same direction simultaneously. In the case of symport, one of the substances is transported against its concentration gradient while the other substance is transported down its concentration gradient.
Sodium glucose cotransport is an example of symport as it involves the simultaneous transport of sodium ions (Na+) and glucose molecules into the cell. In this process, sodium ions are transported into the cell against their concentration gradient, utilizing the energy stored in the electrochemical gradient established by the sodium potassium ATPase pump. At the same time, glucose molecules are transported into the cell with the concentration gradient established by the sodium concentration gradient.
Therefore, the correct answer is B) sodium glucose cotransport.