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redheadprincess redheadprincess
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3 years ago
Which of the following statements concerning active transport is true?
 a. It takes place in the same direction as a concentration gradient.
  b. It requires no expenditure of energy by the cell.
  c. It can be compared to water running downhill.
  d. A membrane-associate protein must be involved.
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cstanish2cstanish2
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3 years ago
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