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active transport

n.
1.transport of a substance (as a protein or drug) across a cell membrane against the concentration gradient

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    Idiom of the Day

    when the chips are down
    at the final and critical moment, when things really become difficult
    When the chips are down the man will always come and help his friends.



    1.
    In the U.S. the working ________ is from Monday to Saturday.

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