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Biology 13 Online
OpenStudy (timothy.hallett):

What type of transport takes place when a protein allows an ion to enter a cell, but no additional energy is needed to make this happen?

OpenStudy (chpatterson):

facilitated diffusion. noun. in cell biology, a process by which substances are transported across cell membranes by means of protein carrier molecules; also called facilitated transport.

OpenStudy (chpatterson):

so facilitated is your answer

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