The permeability of a biological membrane is dependent on the type of transport proteins that are present in the membrane and the lipid bi-layer being permeable to primarily small, nonpolar molecules.
the type of transport proteins that are present in the membrane &the lipid bilayer being permeable to primarily small, nonpolar molecules
This friggin' question's part of my homework too. I don't quite understand what it's asking either, but here goes nothing. I think the selective permeability of biological membranes are dependent on several things:
1. the concentration gradient (diffusion/passive transport/osmosis)
2. the electrochemical gradient (opposite charges on opposite sides of the membrane, so ions flow to where they're attracted)
3. the kinds of transport proteins present, whether the gated channels facilitate certain molecules, or whether some transport proteins are substance- specific
3. the fluidity of the membrane, caused by unsaturated/saturated carbon tails and/or cholesterol
4. the kind of cell it is, because certain cells are equipped with the proper parts to secrete certain substances and/or take certain substances in (ex. pancreatic cells secrete insulin, muscle cells have a lot of sodium- potassium pumps, etc.)
p.s. It may also depend on the polarity of the membrane and the substance being diffused through the membrane. And, also the purpose of the membrane, in the context of what it is "hard- wired" to do.
The type of transport proteins present in the membrane and the lipid bilayer being permeable to primarily small, non-polar molecules.
Selective permeability of cell membranes are rendered by protein pumps or transporters.
phospholipids
The cell membranes main job is to protect the cell and draw in essential nutrients. By selective permeability useful nutrients go in and waste products are excreted.
Selective permeable
Selective permeability refers to the fact that the plasma membrane can choose which molecules to let in or out of the cell.
Selective Permeability
selective permeability
The cell membranes main job is to protect the cell and draw in essential nutrients. By selective permeability useful nutrients go in and waste products are excreted.
Yes, it's a major factor in maintaining the internal environment of cells.
Selective permeable
Cell membrane
The cell membrane controls selective permeability. Larger substances can enter the cell through endocytosis and exit through exocytosis.
GENETICS
A membrane is selectively permeable.
Selective permeability refers to the fact that the plasma membrane can choose which molecules to let in or out of the cell.
The selective permeability of a cells membrane helps the cell to maintain homeostasis because it controls what goes in and out of the cell. This is extremely important for the health of the cell.
Selective Permeability
Capillary walls & Cell membranes
Selective permeability refers to the function of plasma membranes that is needed to maintain homeostasis in a cell and prevent foriegn substances from entering through the cells walls. Some molecules can pass, some are blocked