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Active transport

Definition

noun

A kind of transport wherein ions or molecules move against a concentration gradient, which means movement in the direction opposite that of diffusion – or – movement from an area of lower concentration to an area of higher concentration. Hence, this process will require expenditure of energy, and the assistance of a type of protein called a carrier protein.


Supplement

Active transport is important so that substances can move in and out of a cell across the selectively permeable cell membrane against a concentration gradient.


Compare: passive transport, diffusion.
See also: concentration gradient.


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Transpiration Please help Me

the process of transpiration is an active transport. Plants need to constantly keep pumping H+ ions from the stomata cells in order to keep the ...

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by MrMistery
Sun Jul 26, 2009 12:48 am
 
Forum: Botany Discussion
Topic: Transpiration Please help Me
Replies: 4
Views: 644

Transpiration Please help Me

... the other hand are alive and can pump sap in either direction, they use active transport to achieve this, carbohydrates have a lot of trouble diffusing because of their size.

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by futurezoologist
Sun May 31, 2009 11:27 am
 
Forum: Botany Discussion
Topic: Transpiration Please help Me
Replies: 4
Views: 644

Transpiration Please help Me

... been arguing with my friends that wether ascent of sap is diffusion or active transport? please help me coz nothing is on the internet about it?

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by asker94
Sat May 02, 2009 8:01 am
 
Forum: Botany Discussion
Topic: Transpiration Please help Me
Replies: 4
Views: 644

Re: mechanisms of membrane transport

... cell membrane. The memebrane forms vesicles around the large molecule. active transport- can be in either protein channels or carrier proteins but go from low to high concentration ...

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by sapphirearth
Fri Mar 13, 2009 5:28 am
 
Forum: Molecular Biology
Topic: mechanisms of membrane transport
Replies: 2
Views: 880

Na/K Pump in cold conditions

... and K diffuse passively according to their gradients. Then there is the active Na/K pump that pumps against the respective gradients. My question ... the cell will equalize. Also, since the NA/K pump sets up gradients to transport other molecules like glucose against its gradient, there would ...

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by toshiba8899
Thu Jan 29, 2009 5:26 am
 
Forum: Cell Biology
Topic: Na/K Pump in cold conditions
Replies: 2
Views: 519
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