mermer Posted September 25, 2011 Report Share Posted September 25, 2011 so i have to make an analogy of protein channels of a a cell.based on like house stuff, like sewage, doors windows like that..but i honestly still don't get it. in the membrane structure chapter, theres only somethign about phospholipids and cholesterol. please help thanks Reply Link to post Share on other sites More sharing options...
Mahuta ♥ Posted September 25, 2011 Report Share Posted September 25, 2011 Do you want to understand how protein channels work, what they are or how to make an analogy of them? Reply Link to post Share on other sites More sharing options...
mermer Posted September 25, 2011 Author Report Share Posted September 25, 2011 yeess please. Reply Link to post Share on other sites More sharing options...
Sandwich Posted September 25, 2011 Report Share Posted September 25, 2011 yeess please. Mahuta was asking you a question Which one of those three things she listed do you need help with? Reply Link to post Share on other sites More sharing options...
mermer Posted September 25, 2011 Author Report Share Posted September 25, 2011 how they work and how to make an analogy Reply Link to post Share on other sites More sharing options...
Mahuta ♥ Posted September 25, 2011 Report Share Posted September 25, 2011 Protein Channels are ones implanted in the plasma membrane. As you already know the membrane has 2 poles, hydrophobic and hydrophilic. The hydrophobic being the lipid part (the middle of the membrane). There are 3 ways of substance transport through the membrane: Simple diffusion: basically going through directly with no problems. Facilitated diffusion: using protein transports Active transport: using protein pumps. Hydrophilic (water-loving) molecules can't go through by simple diffusion because the inside of the membrane is hydrophobic. Think about it this way, the inside of the membrane hates water, so it wont allow any water-loving substance to go through it so it'll just keep pushing them out. The channel proteins make channels across the membrane of which the inside is hydrophilic. The channel has no problem letting the hydrophilic particles in because well...it loves water too, and the inside of the membrane doesn't have a problem with it because the hydrophilic substances aren't getting anywhere near it. That is facilitated diffusion. I tried to explain this as simply as I can, I hope it made sense. As for the analogy, you can use your imagination now that you understand the concept. Off the top of my head, a person can't go through the wall because well...they just can't break through..they need a door. That's a very poor example but you get the point. Reply Link to post Share on other sites More sharing options...
mermer Posted September 26, 2011 Author Report Share Posted September 26, 2011 thanks for the help! i have a better understanding of it now Reply Link to post Share on other sites More sharing options...
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