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A protein channel is a transport protein that A. always moves substances against a concentration gradient. B. pumps ions out of a cell. C. serves as a tunnel for specific substances. D. always requires energy from the cell.
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Asked 3/13/2012 7:20:09 AM
Updated 5/23/2016 6:48:20 AM
1 Answer/Comment
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Flagged by alfred123 [5/23/2016 6:48:20 AM]
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User: A protein channel is a transport protein that A. always moves substances against a concentration gradient. B. pumps ions out of a cell. C. serves as a tunnel for specific substances. D. always requires energy from the cell.

Weegy: A. always moves substances against a concentration gradient.
yestfl|Points 1441|

Question
Asked 3/13/2012 7:20:09 AM
Updated 5/23/2016 6:48:20 AM
1 Answer/Comment
This conversation has been flagged as incorrect.
Flagged by alfred123 [5/23/2016 6:48:20 AM]
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A protein channel is a transport protein that: serves as a tunnel for specific substances.
Added 5/23/2016 6:48:19 AM
This answer has been confirmed as correct and helpful.
Confirmed by Andrew. [5/23/2016 9:00:18 AM]
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