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Function
Such membranes typically define enclosed spaces or compartments in which cells may maintain a chemical or biochemical environment that differs from the outside. For example, the membrane around peroxisomes shields the rest of the cell from peroxides, and the plasma membrane separates a cell from its surrounding medium. Most organelles are defined by such membranes, and are called membrane-bound organelles. Read full entryThis entry is from Wikipedia,the leading user-contributed encyclopedia.It may not have been reviewed by professional editors(See full disclaimer)
- Biological Membranes
- Teach yourself rapidly and visually. No software & no textbook needed.
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- 1.Biological membrane - Wikipedia, the free encyclopedia
- A biological membrane or biomembrane is an enclosing or separating amphipathic ... Biological membranes also have certain mechanical or elastic properties. ...
- http://en.wikipedia.org/wiki/B
iological_membrane
- 2.Cell membrane - Wikipedia, the free encyclopedia
- Cell membranes contain a variety of biological molecules, notably lipids and proteins. ... temporary interactions with biological membranes, and, once reacted ...
- http://en.wikipedia.org/wiki/C
ell_membrane
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how will the properties of a how will the properties of a
biological membrane change if
the fatty acid tails of the
phospholipids are converted
from saturated to unsaturated
chains?
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unsaturated chains will develop double bonds. these bonds will cause kinks in the tail and the packing of phospholipids in the bilayer will become less compact and hence give you a more fluid bilayer. |
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How do phospholipids and I'm interested in mainly how
proteins come to become a part
of the membrane.
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Well the membrane pretty much concsists of Phospholipid heads which are Hydrophilic (Attracted to water) and Phospholipid tails (which are composed of lipids) are Hydrophobic (Repelled from water). Many of the proteins that become "lodged" or stuck inside the membrane are Amphiphilic which means they have regions that are Hydrophilic and regions that are Hydrophobic. This combination allows for proteins to become part of the membrane (also called integral proteins) and proteins that lay on top of the membrane (which are called peripheral proteins). Depending on the protein and its location they have different functions, such as the transport of ions through their concentration gradient. Hope this helps! |
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The permeability of a A. the size and polarity of
the solute
B.the types of transport
proteins in the membrane
C. the phospholipid
composition of the membrane
D. The first and second
answers are correct.
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The correct answer is D. If the solute molecule or ion is too large to fit through the cell membrane, or if it is nonpolar and repelled by the hydrophilic heads of the membrane phospholipids, then a transport protein will be required for the solute to pass through the cell membrane. If the cell lacks the correct type of transport protein, then the solute will not be able to pass through the membrane at all. |
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