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Explain why osmosis is different from diffusion?
Osmosis is specifically the movement of water from an area of high water concentration to an area of low water concentration across a small semipermeable membrane. Diffusion is the movement of other particles from an area of high concentration to an area of low concentration, either directly across the phospholipid bilayer or through protein channels imbedded in the phospholipid bilayer
How does faciliated diffusion work?
Facilitated diffusion is the process in which a membrane protein helps (facilitates) a substance pass through the bilayer. For example, water is too big a molecule to passively diffuse through the phospholipid bilayer and does not need to be actively imported. So the solution to this, is to put a transmembrane protein in the bilayer to form a channel big enough for the water molecule to pass through. I don't know how much you need to know, but just as a side note, the channel protein will be in its secondary structure, either as a beta sheet or alpha helix. I hope that helps.
Definition of solute pumping?
"Solute pumping allows a molecule that cannot regularly cross the lipid bilayer to enter the cell by way of a protein channel, however solute pumping requires ATP to change the shape of the protein channel to allow the molecule to pass through, therefore it is a form of active transport."
How does H20 cross the membrane?
Aquaporin Water Channels. A special protein channel with a polar side lets water in but not other substance. The water must aline itself and slide through the narrow channel. Also known as osmosis. For more info look up "Aquaporin Water Channels" Nobel Prize in Chemistry Winners.
What type of molecule is aquaporin?
it is a water channel, a protein molecule
Embedded in the phospholipid bilayer are?
Protein Molecules
What is another name for the phospholipid bilayer?
It depends on which lipid bilayer you're talking about. There is the phospholipid bilayer that surrounds eukaryotic cells, cholesterol phospholipid bilayers, protein lipid bilayers, phase transition lipid bilayer, lipid bilayer membrane...
Explain why osmosis is different from diffusion?
Osmosis is specifically the movement of water from an area of high water concentration to an area of low water concentration across a small semipermeable membrane. Diffusion is the movement of other particles from an area of high concentration to an area of low concentration, either directly across the phospholipid bilayer or through protein channels imbedded in the phospholipid bilayer
Embedded in the phospholipid bilayer?
Protein Molecules
The double layer of phospholipids is called a what?
The double layer of phospholipids is called the phospholipid bilayer. It forms the basis of every membrane, both the plasma membrane and all internal membranes.The idea that the bilayer has protein molecules embedded in it is the essence of the fluid mosaic model of the cell membrane.
Is a protein that forms an ion channel through a membrane is most likely to be a peripheral protein a trans membrane protein a phospholipid an enzyme or an entirely outside the phospholipid?
A protein that forms an ion channel through a membrane is most likely to be a transmembrane protein.
The part of a membrane protein that extends through the phospholipid bilayer is primarily composed of amino acids that are?
non-polar
Which phospholipid bilayer has intrinsic and extrinsic protein molecules?
I'm pretty sure its a cell membrane :)
Why cant water simply diffuse through the phospholipid bilayer?
Because there is a hydrophobic core in the phospholipid bilayer, it may be difficult for water molecules to pass through the membrane. Therefore, there are proteins that aid this process called aquaporins.
How does faciliated diffusion work?
Facilitated diffusion is the process in which a membrane protein helps (facilitates) a substance pass through the bilayer. For example, water is too big a molecule to passively diffuse through the phospholipid bilayer and does not need to be actively imported. So the solution to this, is to put a transmembrane protein in the bilayer to form a channel big enough for the water molecule to pass through. I don't know how much you need to know, but just as a side note, the channel protein will be in its secondary structure, either as a beta sheet or alpha helix. I hope that helps.
In which layer of the epidermal cells is the waterproofed protein?
I'm not sure what your question is asking - if you mean what waterproofs cells in general, it's the phospholipid bilayer. In cells, the phospholipid bilayer has a hydrophobic (water hating) tail, pointed inwards, and a hydrophillic head (water loving) head on the outside.
What is faciliteted diffusion?
moecules passing accross the phospholipid bilayer, AGIANST the graient because the carrier protein is using ATP to do this e.g. glucose
