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Membrane
A membrane is a selective barrier at times it is also a outer covering of cell or cell organell that allows the passage of certain constituents and retains other constituents found in the liquid.
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Asked 5/3/2010 10:56:41 AM
Updated 10/19/2014 2:01:18 PM
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yumdrea
[10/19/2014 2:01:18 PM]
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Membrane
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alfred123
A membrane is a selective barrier at times it is also a outer covering of cell or cell organell that allows the passage of certain constituents and retains other constituents found in the liquid.
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Added 10/19/2014 1:46:26 PM
This answer has been confirmed as correct and helpful.
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yumdrea
[10/19/2014 2:01:12 PM]
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debnjerry
membrane n.
1.Biology.
a.A thin, pliable layer of tissue covering surfaces or separating or connecting regions, structures, or organs of an animal or a plant.
b.Cell membrane.
2.A piece of parchment.
3.Chemistry. A thin sheet of natural or synthetic material that is permeable to substances in solution.
Added 5/3/2010 11:11:12 AM
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Active
Weegy:
Active Transport - When cells must move materials in an opposite direction - against a concentration gradient.
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Updated 10/19/2014 5:08:22 PM
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alfred123
Active: doing things that require physical movement and energy.
Added 10/19/2014 5:03:42 PM
This answer has been confirmed as correct and helpful.
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yumdrea
[10/19/2014 5:08:21 PM]
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