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Some water molecules and small ions ( depending on charge, other ions need passive or active transport ) can diffuse across the cell's membrane and there are channels called porins that facilitate water molecule passage into the cell.
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∙ 11y ago
Wiki User
∙ 13y agoA cell's membrane is composed of a phospholipid bilayer, which is a lipid attached to two phosphates. This molecule is placed so that two pospholipid's phosphates are touching eachother. This forms membrane. The Cell can open and close this to let materials in and out. The Lipids are hydrophelic, meaning they like water. The Phosphates are hydrophobic, meaning they hate water.
Actually, the lipids are nonpolar, and therefore do not dissolve in water, which is polar. This is why the lipids are oriented so that they either face out or in to the cell. This allows the cells to exist. Otherwise they would dissolve in the blood or tissue fluid. The phophates are polar like water, and would dissolve into the blood or tissue fluid if the lipids were not present.
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∙ 13y agoChannels in some cell membrane/integral proteins.
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∙ 9y agoWater molecules and small ions enter a cell through lipid channels. Most of the molecules cannot diffuse via the phospholid bilayer.
Wiki User
∙ 11y agoA few, like OH- can pass the membrane without help, but most ions need canal proteins (that means a uniport, symport, or antiporter) and probably a carrier protein additionally.
Wiki User
∙ 13y agolipid channels
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What are the special structures in the cell membrane that allow water and sugar pass through it made of?
These special structures are called protein gates or protein channels. Water is able to diffuse through the cell membrane since it is a small molecule. However, there are channels called aquaporins that allow water to enter the cell. A glucose molecule cannot just diffuse into a cell. There are glucose channels on the surface of the cell membrane that bind glucose molecules and allow them to enter the cell.
Osmosis occurs as water can cross the lipid bilayer through what?
The cell membrane is permeable to water molecules even though they are polar, due to the fact that water molecules are small.
What kind of molecules can easily pass through a cell membrane?
Small, Non-polar molecules. If the molecule is polar, it sticks to both sides of the membrane, and has to go through selective routes. The easiest to get through is the Non-polar (oxygen and carbon).
How does Oxygen cross cell membrane?
Oxygen and water molecules can penetrate the cell membrane due to small gaps that are created by the lipid molecules. Lipid molecules overlap each other which makes the gaps. The oxygen and water molecules then enter in the gaps. The cell membrane in this case is semi permeable.
As the concentration of molecules outside a cell increases more molecules will enter the cell?
the molecules are moving down their concentration gradient BACK NEXT
How do water molecules and small ions enter cells?
Some water molecules and small ions ( depending on charge, other ions need passive or active transport ) can diffuse across the cell's membrane and there are channels called porins that facilitate water molecule passage into the cell.
How does a cell allow small molecules enter and exit?
"The cell membrane has openings in it." (PLATO) (:
How do fatty acid molecules differ from amino acid molecule?
amino acid molecules are water soluble meaning they cannot enter the cell. Fatty acid molecules CAN enter the cell.
How are amino acid molecules and fatty acid molecules the same?
amino acid molecules are water soluble meaning they cannot enter the cell. Fatty acid molecules CAN enter the cell.
How do water soluble molecules enter or exit a cell?
Water molecules move by osmosis through the cell membrane which is a selectively permeable membrane. Since the middle of the lipid bilayer is hydrophobic, the movement of water is made possible by water channels or aquaporins in the membrane.
What types of materials can enter the cell?
small molecules through the integral proteins in the phospholipid bilayer
Water soluble molecules often enter or exit a cell in what process?
osmosis ....i think
What goes through the cell?
Nonpolar molecules (example: lipids) Small polar molecules such as water
Describe the conditions needed for molecules to enter a cell passively?
The molecules should be small and non-polar, also the concentration radient on the outside of the cell should be higher .
What goes through the cell membrane?
Nonpolar molecules (example: lipids) Small polar molecules such as water
What selects which molecules enter the cell?
Nuclear decide and allow which molecules will be enter in the cell,- Isrg Rajan
What are the special structures in the cell membrane that allow water and sugar pass through it made of?
These special structures are called protein gates or protein channels. Water is able to diffuse through the cell membrane since it is a small molecule. However, there are channels called aquaporins that allow water to enter the cell. A glucose molecule cannot just diffuse into a cell. There are glucose channels on the surface of the cell membrane that bind glucose molecules and allow them to enter the cell.
