active transport

A. Van Laere Andre.VanLaere at bio.KULeuven.ac.be
Fri Oct 1 02:53:31 EST 1999



"Grant R. Cramer" <cramer at MED.UNR.EDU> wrote in article
<199909291656.JAA08843 at equinox.comnet.unr.edu>...
> The answer is No. Water is not transported actively in a plant. The 
> definition of "active transport" is not based upon the use of ATP. It is
> defined as the movement of a substance from a lower chemical potential
(free
> energy) to a region of higher chemical potential. Water always moves
> passively down its chemical potential gradient. 
I have always been wondering if (and how) this  also can explain the
operation of pulsating vacuoles?? Or to they also secrete a concentrated
salt solution??




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