Discussion of all aspects of cellular structure, physiology and communication.
10 posts • Page 1 of 1
The chemiosmotic theory is about the formation of ATP in respiration and light reaction of photosynthesis. It states that a proton gradient is established by the action of a primary proton pump (energy comes from electrons jumping in the ETC) and this proton gradient drives the synthesis of ATP through a secondary pump(ATPase) through which DIFFUSION occurs.
Now my question is......What is this type of diffusion called?? Is it facilitated diffusion???
10ks for your help
NIce point...i think the diffusion of H+s down its gradient is facilitated! But its not active...i'll rather call it 'activating' diffusion as it give you ATP!
& about the movement of H+ while creating the gradient is 'active' in the sense it requires energy [ATP not used though!]
Is there any biogeek here to confirm this..?
if u need energy, then it is facilitated diffusion
The movement of protons while creating the gradient is actve transport. I'm not sure about the diffusion of protons down their gradient. 'Activating' is not the correct word. Anyone knows what this type of diffusion called?
Facilitated diffusion does not need energy to occur. It's active transport that needs energy.
Yes i know that...i said i'll call it activating transport...
don't mind new words...if there is no term there...
sorry about that, facilitated diffusion need a integral protein that function like a pump
hope i get it right this time,
hey! i think you guys might be missing the whole point in this guys question. he isn't asking about how the protons get INTO the intermembranal space, but instead he's asking by what means they get OUT.
dudes, there is an electrochemical gradient produced due to the build-up of protons in the intermembranal space. this results in protons diffusing out of the intermembranal space into the matrix of the mitochondria via protien channels containing ATPase.
No ATP is required here because the protons are travelling down the electrochemical gradient. Therefore it's simple diffusion.
It isn't facilitated diffusion because facilitated diffusion is utilized for the transport of molecules which are too large to pass through the membrane itself, molecules such as glucose. Protons are water soluble and quite small so i don't think you'll need a carrier protien to transport them across the membrane but rather through a hydrophilic channel protien.
Since when did what we pay for coloured cloth gauge our gravity?
Sorry to burst your buble d00d, but it is facilitated diffusion. Now, diffusion can be of 2 types: simple difusion and facilitated diffusion.
Simple diffusion occurs when substances pass down their concentration gradient THROUGH the lipid bilayer. to do so a molecule needs to be either very small(O2,CO2,H2O) or lipid soluble(like steroid hormones).
Facillitated diffusion occurs when substances pass thourgh different proteins down their concentration gradient. This can either take palce through an ion channel for ions or through a permease for small polar molecules(like the glucose permeaze famiy: GLUT).
So yes, it is facillitated diffusion.
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter
10 posts • Page 1 of 1
Who is online
Users browsing this forum: No registered users and 2 guests