In secondary active transport, when the driving ion concentration is high and the transport ion concentration is low
outside of the cell, in which direction will the two ions move?
a. As the driving ion moves in, the transport ion moves in.
b. As the driving ion moves in, the transport ion moves out.
c. As the driving ion moves out, the transport ion moves in.
d. As the driving ion moves out, the transport ion moves out.
e. As long as both ions are moving together, they can go either in or out.
ANSWER: a
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