Why can't most polar molecules and ions enter cells?

Discussion of all aspects of biological molecules, biochemical processes and laboratory procedures in the field.

Moderators: Leonid, amiradm, BioTeam

Post Reply
90josue03
Garter
Garter
Posts: 1
Joined: Thu Jul 12, 2007 4:23 pm

Why can't most polar molecules and ions enter cells?

Post by 90josue03 » Thu Jul 12, 2007 4:28 pm

Many food particlesare polar, How do these get into the cell? why can't most polar molecules and ions do it too?

siroma
Garter
Garter
Posts: 32
Joined: Thu Jun 28, 2007 5:31 pm

Post by siroma » Sun Jul 15, 2007 11:11 pm

1. You have somehow to channel polar hydrophiles through hydrophobic membrane. If it's down electrochemical gradient of food particles, simple pores can be used.
Against the potential you have active primary or secondary transport ( pumps or simports/antiports respectively ).

2. You have to invest energy without regain if you dehydrate and put hydrophilic molecule into hydrophobic environment.

Post Reply

Who is online

Users browsing this forum: No registered users and 0 guests