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37 Cards in this Set

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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?
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
Recepter proteins, marker proteins, channel proteins
Receptor proteins
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.
Hand in a glove?
on the outside of a cell, a specifically shaped molecule fits into the protein
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?
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
Recepter proteins, marker proteins, channel proteins
Receptor proteins
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.
Hand in a glove?
on the outside of a cell, a specifically shaped molecule fits into the protein
Marker protein
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)
Channel protein
specifically shaped protein that fits all the hway through the lipid bilayer.
What do channel proteins transport?
Polar sugars, amino acids and ions.
Types of membranes
Permeable, impermeable a nd semi permeable.
Permeable
nearly all molecules can pass through
Impermeable
nothing can pass through
Semi permeable
many moecules can go through, many cannot.