what type of molecules pass most easily through phospholipid bi layer?
116741
Lipid soluble molecules diffuse through membrane lipids. Small soluble molecules and ions diffuse through membrane channels.
1023754
Diffusion of gas occurs through the one cell layer thick aveoli in the lungs. The speed of diffusion is dependent on different factors, one being the surface area and second the size of the diffusing particles. In the lungs there is ample surface and Oxygen and Co2 are small particles so the rate of diffusion is great. Hemoglobin has a high affinity for O2 in the lungs and a low affinity for CO2. In the tissues the role reverses and hemoglobin has a low affinity for O2 and a greater affinity for CO2. Now in the tissues since they are small molecules O2 and CO2 readily diffuse across the cell membranes and require no special transport mechanisms. This is simple diffusion where gasses are diffusing down their concentration gradient.
914562
Membrane recycling is the process where the cell moves around its membrane and phospholipid molecules where it needs it most. There are both endocytosis and exocytosis which move the membrane (phospholipid bilayer) around. In endocytosis, large particles that can't diffuse through the membrane bind to receptor proteins on the surface of membrane. Then that area caves in when the ligand (whatever the molecules were) binds and pinches of forming a complete circle(sac) with the molecules ont the inside. These sacs called vesicles now move around inside the cell and may find places such as the Golgi Apparatus (which is also made of membrane) and may attach there. that moves membrane AWAY from the outer cell membrane to the inside. In exocytosis, membrane sacs (vesicles) are prepared in the Golgi Apparatus or other membrane oragnelles (in the same fahsion as they were in exocytosis except in different location) and they travel to the outer cell membrane. Here the vesicle slowly fuses with the plasma membrane (outer cell) and secretes the inside. Now the Phospholipid molecules that previously formed the vesicle noow becomes part of the plasma membrane. Sometimes blank or empty vesicles are sent ot plasma membran in order to enlargen it whether secretion takes place. This also applys to endocytosis.\n\nHope this helps and Good luck
880416
TCATTG\n\nT molecules connect with A molecules\nC molecules connect with G molecules
307318
2. Cell membrane and Plasma membrane.
1046638
i don't really know about this but i'm fairly sure i can give a better answer than lrisjqoijgjr  \n\nyou could probably use a surfactant to break down the molecular attraction between the water molecules but this would leave pollution through the path of whatever you were using to travel through the water\n\nbut yeah not really practical but better than uingnpds
359728
Cell membranes are made of lipid bilayers, meaning it is made of a type of fat.  KOH is a strong base that is capable of reacting with the fat in the same reaction that produces soap.  This destroys the lipid bilayer
612940
It would depend on several factors. Small, uncharged molecules can pass through the cell membrane through diffusion. When it is water, it is called osmosis. Diffusion can only occur into the cell when the concentration of the substance is greater outside the cell than within it, and likewise only out of the cell when the concetration is greater inside the cell than outside. This is called the concentration gradient.\n\nWhen the molecule is charged or is large (such as a chlorine ion or a lactose molecule), it requires active transport by carrier proteins. There are also carrier proteins that help to transport against the concentration gradient.\n\n[Edit] \nAfter thinking for a bit, I believe it would be pertinent to include something about the more complex methods of active transport.\n\nThere are two "directions" of the complex forms of active transport: in (endocytosis) and out (exocytosis).\n\nExocytosis is when a vesicle, after being released from the Golgi complex, fuses to the cell membrane, releasing the contents.\n\nEndocytosis is done by three main means: Phagocytosis, Pinocytosis, and Receptor-Mediated Endocytosis.\n\nPhagocytosis is the process of enveloping a large particle, such as how many unicellular organisms "eat" other organisms. The large particle comes in contact with the cell membrane, stimulating the formation of a vesicle. This vesicle then enters the cell and depending on the contents may fuse with a lysosome to help to digest it.\n\nPinocytosis also forms a vesicle, but differs from phagocytosis because it forms a much smaller vesicle.\n\nReceptor-mediated endocytosis is when particles that cannot normally enter the cell bond to receptor proteins embedded in the cell membrane. These proteins then congregate and form a vesicle. \n\nIn all forms of endocytosis and exocytosis, ATP is required for energy.
246458
The cell membrane is made up of a phospholipid bilayer, with a polar phophate head and a nonpolar lipid tail. The polar head is hydrophilic, the nonpolar tail is hydrophobic. A fat molecule will face toward the nonpolar, hydrophobic tail.
54079
There are numerous proteins embedded in the lipid bilayer of the cell membrane; some, like adrenergic receptors and porins (channels things move through), perforate the membrane; others protrude out one part, not another.  Others, like the G-proteins and the enzymes that phosphorlate and dephosphorylate other membrane proteins, stay pretty much entirely in the membrane.\nMany of the proteins, such as receptors and porins, move fairly freely; others, particularly the proteins that cause adherence between cells, are fixed in place.\nI guess the best answer is that the arrangement of the proteins in the cell membrane is complex, and for many proteins, ever changing, but for others, static.  It's not nearly as simple as it looks.  For instance, in modeling the large membrane proteins, the cell membrane is effectively a gas in two of three dimensions, and a solid in the third...  Go figure.
98589
Transmembrane proteins form channels through the lipid bilayer.\nThere are different sorts of channels, ion channels for example.\nIn the case of ions, they would not normally be able to cross the membrane, a channel protein (plus associated mechanisms) make it possible.
732842
Membrane proteins.\n\nSome membrane proteins act as channel proteins that allow for passive diffusion of solutes across the membrane.\n\nOthers are transport proteins that take part actively (require energy) in transport across the membrane. Some transport proteins may be gated.
879801
Pentane\n\nIt depends on which compound has the strongest intermolecular forces. In the case of hydrocarbons the intermolecular forces that are present are dispersion forces.\nIn such cases:\n"The more branched a molecule is, the more "spherical" it is, and the smaller surface area it will have - since dispersion forces increase with surface area, the more branched molecules will have a lower boiling point. You may notice that the trend in the melting points is rather different - this is because the longer a branch is, the more potential it has to flop around and disrupt the regular crystalline lattice of frozen pentane, giving a liquid state."
708354
If you're speaking of passive diffusion across the membrane, heat will increase the fluidity of the membrane making it more permeable.\n\nWith facilitated diffusion, involving a tranmembrane enzyme, the permeability increases to a point, and then decreases as the enzymatic structure is degraded
778955
The cell membrane is a lipid bilayer made from phospholipids.  As a lipid, it is permeable to other lipids (e.g. steroid hormones) but not to polar molecules (e.g. potassium or glucose).  Polar molecules require various types of membrane proteins (e.g. potassium channels) or endocytosis (glucose) for absorption into the cell.  \n\nHope this is helpful for you.  Best wishes and good luck.
250912
Complex III (bc1 complex): H+ transport in complex III involves   coenzyme Q (CoQ). The "Q cycle" depends on the mobility of CoQ within the lipid bilayer. According to some proposed models, the reaction cycle may involve one-electron transfers, with an intermediate semiquinone radical state.
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The semipermeable membrane that encloses the cytoplasm of a cell.