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Phosphate groups
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Which part of the cell membrane is polar and allows the cell to exist in the water?
Phosphate groups
What part of the cell is polar and allows the cells to exist in water?
Phosphate groups
Can steriods and cholesterol cross the cell membrane on their own?
Yes because the cell membrane allows non polar molecules through
What Structures serves as the cells outer boundary and regulates what goes in?
If it's an animal cell, it's cell membrane. If it's a plant cell, it's cell wall. The cellular membrane is made up of various proteins found in a fluid of phospholipid molecules that create a bilayer The bilayer is formed when the polar water molecules repel the non-polar tails of the phospholipids causing them to stack up and form a non-polar interior. The non polar of the interior impedes the passage of water soluble substances. The bilayer sheets contain other proteins that serve various functions to allow passage in and out of the cell and help make up the membrane.
What is the outermost component of all cells?
The outermost living part of a cell is the cell membrane. The cell membrane regulates what comes into the cell and what goes out of the cell. It is composed of a double layer of phospholipids and proteins.
Which part of the cell membrane is polar and allows the cell to exist in the water?
Phosphate groups
Which part the cell membrane is polar and allows the cell to exist in water?
Phosphate groups
What part of the cell is polar and allows the cells to exist in water?
Phosphate groups
What part of cell membrane Is polar and allows the cell to exist in water?
Phosphate groups
Can steriods and cholesterol cross the cell membrane on their own?
Yes because the cell membrane allows non polar molecules through
Which part of the cell is polar and allows the cell to exist in water?
Phosphate groups
What is the functions to the cell membrane?
The Cell membrane contains the insides of the cell. The membrane is also selectively permeable, allowing nonpolar molecules to simply diffuse into the cells, such as lipids, steroid based hormones, CO2, etc. It also allows small polar molecules to diffuse through, such as H2O.
What part of the cell membrane is polar and allows the cell to exits in water?
The cell membrane is made out of two layers , a nonpolar and polar part. The polar part is the hydrophilic part , meaning water loving , and the nonpolar is hydrophobic part - water hating. The polar/hydrophilic part is inside of the membrane and the outer portion is the hydrophobic/nonpolar . You don't want the cell to exist in water or be soluble in water because then we would dissolve , all our cells , tissues etc. That's why the cell membranes outer portion is nonpolar and is not miscible with water . The cell membrane allows water molecules to come in and out of the cell by osmosis , and that is when water molecules can free out and in of the cell through the cell membrane .
How is facilitated diffusion differing from diffusion?
Simple diffusion allows non-polar molecules to pass through and a little amount of H20. On the other hand, Facilitated diffusion allows ions and polar molecules across the membrane because it contains carrier proteins. It is highly specific to substances it diffuses across the membrane.
Because cells have a watery environment bothinside and outside the polar ends of the phospholipids in the plasma membrane from layer?
The hydrophilic (polar) ends of phospholipids in the plasma membrane face the watery environment inside and outside the cell, as they interact with water molecules due to their charge. This arrangement allows the phospholipid bilayer to form a stable barrier that separates the internal and external environments of the cell, while still allowing for selective transport of molecules across the membrane.
How does a polar substance get across a cells plasma membrane without the expendture of energy assuming it is more concentrated outside the cell?
Facilitated diffusion
What is the chemical biological relevance of polar molecules?
our cells are surrounded by a cell membrane that is a lipid bilayer. this means that the hydrophilic heads, like water, are pointed towards the inside of the cell and the cells' exteriors. this allows polar molecules to move through the membrane and be dissolved within the membrane. the hydrophobic tails of this lipic bilayer are pointed towards eachother. these cannot be in contact with water or nothing will dissolve or be able to pass through them. O==O, the circles are the hydrophilic heads and the lines are the hydrophobic tails.
