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Proteins are too large to move across the phospholipid bilayer of the cell membrane so therefore require help getting into (or out of) the cell. Proteins may be brought across the cell membrane by endocytosis - they may then be broken down into amino acid building blocks (by fusion of the endocytotic vesicles with the proteolytic enzyme containing lysosomes) which can then be used by the cell or moved out of the cell by transmembrane transport proteins.
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∙ 12y ago
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∙ 12y agothe permeability of a particle depends on the size of the particle and the charge of the particle. If the particle is small and relatively neutral it is most likely able to permeate the phospholipid bilayer membrane, particles that are large and charged, negative or positive, are not able to pass through
These protein channels also have cholesterol markers, so some substances that match those markers are able to pass through regardless of charge or size
Osmosis is also another factor that always objects to go through a membrane through various processes, mostly endocytosis
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∙ 9y agoSolute molecules, such as ions(Na/K) are transported across the membrane selectively by active transport. Gases such as oxygen or CO2, water molecules normally pass by simple diffusion. Ion channels are the proteins present on the membrane that allows the transport of molecules.
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∙ 14y agoYou could consider, carrier proteins to be special doorways in the cell membranes.
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∙ 7y agocellular diffusion, active and passive transport
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∙ 12y agoit is nothing but a bunch of booty
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∙ 13y agoit is proteins
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∙ 11y agoactive transport and pasive transport
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∙ 11y agoOsmosis
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∙ 11y agoWater
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What are the special doorways in the cell membrane made of?
No
How large particles can exit a cell?
It has something to do with the plasma membrane of the cell that allows movement of material into and out of a cell. Yes, but they have to have some sort of "windows" and doorways" which in this case are proteins.
Is not a function of protein in a cell membrane?
Proteins are not primary components of cell membrane. The proteins on the cell membrane have special functions, like receptors and transporters.
Where are cell products chemically modified and stored?
Every cell has a a cell membrane and only water, oxygen, and CO2 can pass through it. The protein doorways help bring in large molecules. Waste products get sent out by the vesicles (which have there own membrane). Cells have organelles which are tiny organs in the cells. So basically the cell products are protected by the cell membrane which is made of layers of linked molecules.
Is a special type of diffusion that involves moving across a cell membrane?
osmosis is a special type of diffusion that involves water moving across a cell membrane hopefuly this helped :)
What are the special doorways in the cell membrane made of?
No
How large particles can exit a cell?
It has something to do with the plasma membrane of the cell that allows movement of material into and out of a cell. Yes, but they have to have some sort of "windows" and doorways" which in this case are proteins.
The part of the cell that regulates what can enter and leave?
The cell membrane determines what comes in and what goes out. Water goes in and out by osmosis which is a passive method. Others require the help of proteins that act as doorways. These require energy and the method is called active transportation.
Is not a function of protein in a cell membrane?
Proteins are not primary components of cell membrane. The proteins on the cell membrane have special functions, like receptors and transporters.
Where are cell products chemically modified and stored?
Every cell has a a cell membrane and only water, oxygen, and CO2 can pass through it. The protein doorways help bring in large molecules. Waste products get sent out by the vesicles (which have there own membrane). Cells have organelles which are tiny organs in the cells. So basically the cell products are protected by the cell membrane which is made of layers of linked molecules.
Is a special type of diffusion that involves moving across a cell membrane?
osmosis is a special type of diffusion that involves water moving across a cell membrane hopefuly this helped :)
Two activities of the cell membrane are?
Two jobs for the cell membrane are to keep things out that should not be there and to allow only a few special things in.
Response in which killer cells transfer special proteins into the cell membrane of a pathogen?
Cell-Mediated Immunity
Can substances move in and out of the cell membrane?
Yes, how else could the cell live. Cell membranes have structures (holes) in them to allow things to move in and out. These holes are special structures in the membrane and they "control" what goes across the membrane. I have made a link below to a diagram of the cell membrane to show some of these structures.
What regulates passage of materials into and out of cells?
The cell membrane controls movement of materials in and out of the cell.
What would happen if materials could not move across the cell membrane?
Isolation. And most materials can NOT move across the cell membrane. (For many things your cells have special proteins within the membrane for transport.)
The process by which glucose can pass through a cell membrane by combining with special carrier molecules is called?
Facilitated diffusion is the process by which glucose can pass through a cell membrane by combining with special carrier molecules.
