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Biology Plasma Membrane Notes

by: Aubrey Oliver

Biology Plasma Membrane Notes Biology 1305

Marketplace > University of Texas at El Paso > Biology > Biology 1305 > Biology Plasma Membrane Notes
Aubrey Oliver
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About this Document

These notes cover what we went over with the cell/plasma membrane. I've went through them and tried to make them easier for everybody to understand. I haven't put the video notes on here, but I wil...
General Biology
Dr. Marsan
Class Notes




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This 3 page Class Notes was uploaded by Aubrey Oliver on Thursday March 10, 2016. The Class Notes belongs to Biology 1305 at University of Texas at El Paso taught by Dr. Marsan in Spring 2016. Since its upload, it has received 8 views. For similar materials see General Biology in Biology at University of Texas at El Paso.


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Date Created: 03/10/16
The Cell Membrane (Plasma Membrane) Made of phospholipid layer amphipathic hydrophilic heads-glycerol heads (outward) -attract water hydrophobic tails- fatty acids (inward) -repel water Contain proteins and carbohydrates Asymmetrical this basically means that when you cut the membrane in half, there will be different amounts of proteins and carbohydrates on each side. Plasma membrane structure Fluid Mosaic Made of a mosaic of lipids, proteins and carbohydrates. to help you remember: Mosaic refers to a piece of art in which multiple pieces of glass, tile and stone are put together in one piece. Video notes: -Cell Membrane/Plasma Membrane: -flexible, regroups if broken -Lipid Molecules of Membrane Double layer -tails repel water, heads attract it. -Cholesterol and Carbohydrates make basic structure of plasma membrane -asymmetrical-an uneven number of components on both halve of membrane -Proteins -act as receptors for signals from outside of the cell -move nutrients and waste in and out of the cell -regulates what comes in and out -Molecules (lipids, carbohydrates, proteins) are always moving -mixture of molecules make up mosaic -move in a fluid like manor Proteins Integral and Intrinsic Proteins -Transmembrane-is embedded into hydrophobic layer of the cell membrane (meaning it goes all the way to through the membrane) -Lipid anchored- Basically means what it says, amino acid of proteins linked to lipid by covalent bond Movement (Integral Proteins) -10-70% membrane proteins can be stationary depending on their cell type For instance, a protein that is bound to the cytoskeleton cannot move because it is bound to an cytoskeleton -If a membrane protein is bound to a molecule outside of the cell, like the extracellular matrix, it cannot move either. Extracellular matrix- network of proteins that are connected together cytoskeleton- basically gives the cell structure, helps it keep its shape ­ Component Synthesis Smooth ER -Synthesis of lipids -both cytosol and endomembrane systems cooperate with one another in order to synthesize lipids -both systems working together occurs only in eukaryotes -Synthesis of transmembrane proteins -Proteins go into Rough ER for synthesis, save for those that are bound to another semiautomatic organelle, then they go straight to the organelle. -ex: Proteins that are bound for mitochondria just go to the mitochondria. -They are moved through transport vesicle to other organelles -transport vesicles transport proteins through cell ­ -Membrane Transport - Plasma/Cell Membrane -selectively permeable -regulates what goes into the cell, meaning that it allows certain things to go into the cell, and certain things not to go into the cell. -Passive transport -transport that requires no energy -Passive Diffusion -this is where a solute goes through the membrane without the help of a transport protein -Facilitated diffusion -this is the opposite of passive transport. When a solute needs to go through the membrane, it has to use a transport membrane in order to so -Active Transport -Requires energy in order to transport through cell -this is when the sodium potassium pump, which helps moves solutes across gradient. The pump is powered by ATP.


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