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37 Cards in this Set
- Front
- Back
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Cell membrane
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regulates what movies into and out of a cell
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Cell membrane maintains what?
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Homeostasis
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Composition of a cell membrane
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phospholipid bilayer and proteins
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2 important phospholipid bilayer terms
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Hydrophilic and hydrophobic
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Hydrophilic
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water loving, applies to polar charged molecules. water molecules are attracted to this end of the phosphlipid.
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What forms a hydrogen bond with water?
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the hydrophilic end of the phospholipid
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Hydrophobic
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water fearing, applies to nonpolar molecules that can't bond with water. water usually pushes this part of the molecule away, and this creates a nonpolar interior zone.
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Bilayer
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caused by the tails of the phospholipid being pushed away by the wter on the inside and outside of the cell.
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"Fluid Mosaic Model" - Fluid
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the phospholipid bilayer is fluid like a soap bubble. (or like puke in a pool...)
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Lipids move around in what side of the bilayer?
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Their side!
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Lipid molecules do not what?
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They do not move from one layer to the other.
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"Fluid Mosaic Model" - Mosaic
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the membrane is studded with an assortment of different proteins. some of them float onnly in one of the lipid layers.
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3 types of proteins on the surface of the membrane
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Recepter proteins, marker proteins, channel proteins
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Receptor proteins
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transmit info from the outside world into the inside of the cell. they are specifically shaped so they fit all the way through the lipid bilayer.
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Hand in a glove?
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on the outside of a cell, a specifically shaped molecule fits into the protein
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Cell membrane
|
regulates what movies into and out of a cell
|
|
|
Cell membrane maintains what?
|
Homeostasis
|
|
|
Composition of a cell membrane
|
phospholipid bilayer and proteins
|
|
|
2 important phospholipid bilayer terms
|
Hydrophilic and hydrophobic
|
|
|
Hydrophilic
|
water loving, applies to polar charged molecules. water molecules are attracted to this end of the phosphlipid.
|
|
|
What forms a hydrogen bond with water?
|
the hydrophilic end of the phospholipid
|
|
|
Hydrophobic
|
water fearing, applies to nonpolar molecules that can't bond with water. water usually pushes this part of the molecule away, and this creates a nonpolar interior zone.
|
|
|
Bilayer
|
caused by the tails of the phospholipid being pushed away by the wter on the inside and outside of the cell.
|
|
|
"Fluid Mosaic Model" - Fluid
|
the phospholipid bilayer is fluid like a soap bubble. (or like puke in a pool...)
|
|
|
Lipids move around in what side of the bilayer?
|
Their side!
|
|
|
Lipid molecules do not what?
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They do not move from one layer to the other.
|
|
|
"Fluid Mosaic Model" - Mosaic
|
the membrane is studded with an assortment of different proteins. some of them float onnly in one of the lipid layers.
|
|
|
3 types of proteins on the surface of the membrane
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Recepter proteins, marker proteins, channel proteins
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|
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Receptor proteins
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transmit info from the outside world into the inside of the cell. they are specifically shaped so they fit all the way through the lipid bilayer.
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|
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Hand in a glove?
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on the outside of a cell, a specifically shaped molecule fits into the protein
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Marker protein
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protein that allows the body to recognize self and non self. its found only in the outer layer of the bilayer (think transplants and rejecting like a new liver or something)
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Channel protein
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specifically shaped protein that fits all the hway through the lipid bilayer.
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What do channel proteins transport?
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Polar sugars, amino acids and ions.
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Types of membranes
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Permeable, impermeable a nd semi permeable.
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Permeable
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nearly all molecules can pass through
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Impermeable
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nothing can pass through
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Semi permeable
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many moecules can go through, many cannot.
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