Biology Lecture 15 - Biology Lecture 15 Within the ER and...

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Biology Lecture 15 Within the ER and golgi apparatus, carbohydrates are added to proteins In the golgi, phosphate groups are also added to signal where the protein has to go Carbohydrates on transmembrane glycoproteins have a cell-cell recognition role outside the cellular membrane Integral proteins penetrate lipid bilayer. Can be transmembrane proteins Major roles of membrane proteins: Transport Enzymatic activity (a lot of enzymes involved in metabolic activity are in the plasma membrane) Signal transduction Intercellular joining (proteins help them stick together) Attachment to the cytoskeleton and extracellular matrix (ECM) Carbohydrates on the EC side of the plasma membrane Branching oligosaccharides Can be glycoproteins or glycolipids Function in cell-cell recognition Molecules that pass through the plasma membrane Nonpolar molecules (CO 2 , O 2 ) Can diffuse across the membrane easily Small polar molecules (water) Can diffuse across the membrane really slow Ions and large polar molecules (Na+, K+)
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This note was uploaded on 05/03/2011 for the course BIO 311 C taught by Professor Mcclelland during the Fall '09 term at University of Texas at Austin.

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Biology Lecture 15 - Biology Lecture 15 Within the ER and...

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