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Cell Membrane
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34
Biology
Undergraduate 2
11/09/2009

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Term
Fluid Mosaic Model contends that membranes consist of
Definition
Phospholipids (Bilayer) and Globular Proteins (Lipid Bilayer)
Term
4 components of the cellular membrane
Definition
Phospholipid Bilayer, Transmembrane Proteins, Iinterior Protein Network, Cell Surface Markers
Term
Which microscope can you view a cell membrane with?
Definition
Electron Microscope
Term
Phospho Lipid structure consists of
Definition
1 Glycerol, 2 Fatty Acids (Attached to the Glycerol), one Phosphate group (Attatched to the Glycerol)
Term
Fatty Acids are nonpolar chains that are made of
Definition
Carbon and Hydrogen
Term
Fatty acids nonpolar nature makes them
Definition
Hydrophobic
Term
The phosphate groups Polar nature makes them
Definition
Hydrophilic
Term
Fatty acids are located where on the bilayer?
Definition
The inside
Term
The phosphate group is located where on the bilayer?
Definition
Both Surfaces
Term
Cold temperatures and Saturated fats make the cell membrane ___ Fluid than Unsaturated fats and Warm temperatures
Definition
Less
Term
Membrane proteins have 6 functions:
Definition
Transporters, Enzymes, Cell Surface Receptors, Cell Surface Identity Markers, Cell to Cell adhesion proteins, Attatchments to the cytoskeleton
Term
Peripheral Membrane Proteins are consisted of nonpolar regions that attatch themselves to one layer of
Definition
Phospholipids
Term
Integral Membrane Proteins span the lipid bilayer, so they are called
Definition
Transmembrane Proteins
Term
Integral proteins possess at least on transmembrane domain, which contains hydro___ amino acids
Definition
Phobic
Term
B-Sheets in the protein form a cylinder called a B-Barrel which is polar. This barrel therefor allows water to
Definition
Pass through the membrane
Term
Passive transport is movement of molecules through the membrane in which
Definition
No energy is required, instead molecules move in response to a concentration gradient
Term
Diffusion is
Definition
Movement of molecules from high concentration to low concentration
Term
Selective permeability is a(n)
Definition
Integral membrane protein that allows the cell to be selective about what passes through a membrane
Term
Channel proteins have a ___ Interior allowing ___ molecules to pass through
Definition
Polar
Term
Carrier proteins bind to a ___ molecule to facilitate its passage
Definition
Specific
Term
Channel proteins include ___ channels, and ___ channels
Definition
Ion channels, and Gated channels
Term
Carrier proteins do what?
Definition
Bind to a molecule that they transport across the membrane
Term
Facilitated diffusion is the movement of a molecule from high concentration to low concentration with the assisstance of ___ and is __ and __
Definition
A carrier protein, specific, passive
Term
In an aqueous solution, water is the ___ and dissolved substances are the ___
Definition
Solvent, Solute
Term
Osmosis is
Definition
Movement of water from high concentration to low concentration (Movement of water to an area of high solute concentration)
Term
When 2 solutions have different osmotic concentrations the ___ solution has a higher solute concentration, while the ___ solution has a lower solute concentration
Definition
Hypertonic, Hypotonic
Term
Osmosis moves water through ___ toward the hypertonic solution
Definition
Aquaporins
Term
Cells use these 3 ways of maintaining osmotic balance
Definition
Extrusion (Water is ejected through contractile vacules), Isosmotic Regulation (Keeping cells isotonic with their environment), Turgor Pressure (pushes cell membrane against the wall to keep cell rigid)
Term
Active Transport requires energy (ATP) and moves substances from ___ to ___ concentration with the assistance of ___
Definition
Low to High, Carrier Proteins
Term
The three carrier proteins used in active transport are
Definition
Uniporters (Move one molecule at a time), Symporters (Move two molecules in same direction), and Antiporters (Move two molecules in seperate directions)
Term
Na+-K+ pump uses which carrier protein
Definition
Antiporters
Term
Coupled transport uses which carrier protein to move glucose against a concentration gradient
Definition
Symporter
Term
Bulk Transport is accomplished with
Definition
Endocytosis (Movement of Substances into a cell), and Exocytosis (Movement of materials out of a cell)
Term
Endocytosis occurs when the plasma membrane envelops a certain food partical or liquid. It can happen in 3 ways
Definition
Phagocytosis (The cell takes in particulate matter), Pinocytosis (Cell takes in only liquid), and Receptor-mediated Endocytosis (Specific molecules are taken in after they bind to a receptor)
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