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Transporting a substance against its concentration gradient requires
A) countertransport with another molecule against its concentration gradient.
B) a transporter that uses energy.
C) cotransport with another molecule against its concentration gradient.
D) a transporter that is facilitated in its diffusion.
E) a channel that is specific for that substance.
Textbook 
Principles of Human Physiology

Principles of Human Physiology


Edition: 5th
Author:
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ch1990ch1990
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