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Lecture 6

Lecture 6.docx

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Wilfrid Laurier University
Louise Dawe

BIOLOGY September 23, 2013 - Ribosomes translate mrna on the outside of the ER - Proteins do not directly go to the golgi complex - Path for secreted protein - Membrane protein follows similar path, but remain in membrane - Proteins that belong in Golgi would stop at Golgi - Some go in reverse order - 1) All of the proteins are translated by ribosomes on the outside of the ER membrane, rough ER is the insert point - 2) all interconnected - Rough ER are making protein of the endomembrane system - Cytosolic proteins made in cytosol will never be chemically modified and will remain there Exocytosis and Endocytosis - vesicles are responsible for transporting materials between compartments of the endomembrane system - also used for secretion to cell exterior, and bringing molecules into the cell - vesicles have to be generated have to be made - Exocytosis: a secretory vesicle fuses with the plasma membrane, releasing the vesicle contents to the cell exterior. The vesicle membrane becomes part of the plasma membrane - Endocytosis: materials from the cell exterior are enclosed in a segment of the plasma membrane that pockets inward What about other types of organelles - Mitochondria and chloroplasts are not part of the endomembrane system - In chloroplasts, taking energy from the sun and using it to make sugars (consuming carbon dioxide and water), mitochondria using that sugar and converting them to carbon dioxide - Both surrounded by a double membrane - Both have their own DNAor their own genome - DNAmolec
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