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What is Active Transport ?

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What is Active Transport ?

Post by shyam on Sun Jan 11, 2009 2:52 pm

drunken

What is Active Transport ?

I want to know something about it ????????

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Hope anybody would not be sleeping and reply Sleep

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Re: What is Active Transport ?

Post by admin @ shivam on Sun Jan 11, 2009 3:05 pm

Active Transport


Active transport is the pumping of molecules or ions through a membrane against their concentration gradient. It requires:

* a transmembrane protein (usually a complex of them) called a transporter and
* energy. The source of this energy is ATP.

The energy of ATP may be used directly or indirectly.


* Direct Active Transport. Some transporters bind ATP directly and use the energy of its hydrolysis to drive active transport.
* Indirect Active Transport. Other transporters use the energy already stored in the gradient of a directly-pumped ion. Direct active transport of the ion establishes a concentration gradient. When this is relieved by facilitated diffusion, the energy released can be harnessed to the pumping of some other ion or molecule.
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Now I know what is Active transport

Post by good boy on Tue Jan 13, 2009 8:31 pm

Now I know what is Active transport

Cool
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Direct Active Transport

Post by biologyisg8 on Wed Jan 14, 2009 10:55 am

Can I know something more about Direct Active Transport ?

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Re: What is Active Transport ?

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