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15 Cards in this Set

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  • Back
Hydrophobic fatty acid tails point ______ each other
toward
Hydrophilic phosphate heads in the cell membrane face _______.
the aqueous environments inside the cell (the cytosol)-also known as intracellular fluid) and outside the cell (the extracellular fluid).
Why is the cell membrane considered fluid?
Because the phospholipids and other molecules are not linked together by chemical bonds, can move about laterally, occasionally move from one side of bilayer to the other.
ICF stands for
Intracellular fluid
ECF stands for
Extracellular fluid
What does the "fluid mosaic model" of plasma membrane stucture?
Consist of phospholipids, choleseterol, proteins, and carbohydrates.
What do cholesterol moecules within the cell membrane do?
Help membrane stay together
Help with fluidity
Interfere with hydrophobic interactions between phospholipid tails (thus helping it stay fluid)
What is a Glycoprotein?
A large protein embedded in membrane.
What is an Integral Membrane Protein?
Embedded within the lipid bilyaer
Can be dissociated from the membrane only by physically disrupting the bilayer.
Amphipathic molecules in contact w/ both lipid libayer and aquesous environment.
Non polar areas are embedded w/in the lipid bilayer.
Go through each side of membrane.
Ensure membrane and cell integrity.
What is a Peripheral Membrane Protein?
May function as an enzyme.
Found on one side or another of membrane, usually on the cytosolic surface.
Often function as part of a group of proteins that make up cytoskeleton.
Loosely bound to membrane. Can be dissociated from membrane and leave membrane intact.
What is a Glycoprotein?
A carbohydrate chain bound to a protein.
Faces the extracellular fluid.
What is a Glycolipid?
A carbohydrate chain bound to a lipid.
Face the ECF.
What are antigens?
Protein or polysaccharide components of viruses, bacteria, fungi, protozoa, parasitic worms, pollen, transplanted tissue, and tumor cells that can be identified by immune cells.
Located on outside of cell membrane.
Function in cell identification.
What is a Lipoprotein?
A combination of lipids and proteins working together.
Possess a hydrophobic interior surrounded by a hydrophillic coat.
Primary vehicle of lipid transport inthe blood or lymphatic system.
The components of the cell membrane effect what?
Cell's permeability.
Polarity of cell.
What it might interact with.
Thickness of membrane.