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Cell Membranes

Structure & Transport Mechanisms

QuestionAnswer
What is the cell membrane composed of? 50% Protein - 45% Lipid - 5% Carbohydrate (Monosaccharide chains)
What is the architecture of the cell membrane? 2 sided Lipid sheet with embedded Proteins
What is an impotant feature of Cell Membranes? Self Assembly and Resealing capabilities
What feature of Cell Membranes assists with Membrane Transport? Lipid Bi-layer is very permeable to NON-Polar molecules & selectively permeable to Polar Molecules and Ions
What is the function of Protein Channels? permit PASSIVE DIFFUSION of SPECIFIC Ions from a HIGH --> LOW concentration
Where are Protein Channels located? they span the Lipid Bilayer
What is the function of Carrier Mediated Transport? to transport Large Polar Molecules in/out of cell
T/F Protein Channels are one of the Carrier Mediated transport systems. F. Protein Cahnnels are sperate from the CMT
What is Facilitated Diffusion? CMT moves Molecules from a HIGH --> LOW concentration through the bilayer
What is a benifit to Facilitated Diffusion? uses NO ATP
Give 2 examples of Facilitated Diffusion. Glucose uptake, Nucleotide uptake
What is Active Transport? CMT moves Molecules from an area of LOW --> HIGH concentration
How do Active Transport systems move Molecules? from LOW --> HIGH - referred to as "PUMPS"
What is a disadvantage of using Active Transport over Facilitated Diffusion? AT uses ATP to break attachment w/ carrier - FD no ATP
What are some examples of Active Transport? Amino Acid transport IN; Potassium Ions IN; Sodium Ions OUT
What do Active Transport and Facilitated Diffusion have in common? both carriers exhibit Carrier Specificity and Carrier Saturation
What is Carrier Specificity? carrier will only transport 1 Specific Molecule
What is Carrier Saturation? all carriers for a specific Molecule within a cell are busy (working w/ others of the same Molecule)
What is Endocytosis and give 2 examples? External Membrane FOLDS INTO the cell - Phagocytosis, Pinocytosis (flluid intake)
What is Exocytosis? Internal Vesicles FUSE with Cell Membrane
What is the function of Exocytosis? provide means to EXPELL Molecules made in the cell
What do Endocytosis and Exocytosis have in common? both REQUIRE Passive Stretching and Active Contraction of the Membrane
Created by: Kristel