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Which of the following statements best describes active transport? a. 1o is against the concentration gradient...

Which of the following statements best describes active transport?

a. 1o is against the concentration gradient while 2o is with the concentration gradient and a membrane associated protein must never be involved; each requires no expenditure of energy by the cell
b. both 1o and 2o take place with the concentration gradient and a membrane associated protein must be involved; each requires no expenditure of energy by the cell
c. a member associated protein must be involved but requires no expenditure of energy by the cell
d. both 1o and 2o take place against the concentration gradient and a membrane associated protein must be involved; each requires input of energy by the cell
e. none of these

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Answer #1

Ans : d) both 1o and 2o take place against the concentration gradient and a membrane associated protein must be involved, each requires input of energy by the cell.

The active transport is governed by two basic things : 1) the transport must be against the concentration gradient and 2) the transport must require the input of energy.

Here both the conditions are fulfilled , so the transport is active. When the transport is with the concentration gradient and does not require any input of energy , it is called as passive transport.

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