PACKAGING, TRANSPORTING and EXPORTING

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Presentation transcript:

PACKAGING, TRANSPORTING and EXPORTING

Ribosomes Tiny (30um) – can only be seen through electron microscope Synthesised in nucleolus of Eukaryote Synthesised in Cytoplasm of Prokaryote Recievesinformation carried from nucleus in the form of mRNA

Protein synthesis Ribosomes attached to ER make proteins for export out of the cell Ribosomes in the cytoplasm make proteins for use inside the cell – ie enzymes, hormones, etc

Endoplasmic Reticulum (ER) Network of membranes and Sacs Internal space (inside the folds) is called the lumen

Endoplasmic Reticulum Rough ER – Studded with ribosomes Site of protein synthesis. Proteins are transported to golgi apparatus via golgi vesicles Smooth ER – Site of Carbohydrate and Lipid Synthesis

Transport around the cell Golgi Vesicles are used as vehicles to transport macromolecules to and from the Golgi Apparatus.

Golgi Apparatus Modifies, sorts, and packages macromolecules for cell secretion or use within the cell Enzymes within the cisternae modify proteins by adding carbohydrates (glycosylation)[12] and phosphates (phosphorylation to form a signal sequence which determines the final destination of the protein Similar to a post office

OTHER FUNCTIONS OF GOLGI Creation of lysosomes Carbohydrate synthesis. Transport of lipids around the cell

Synthesis, Packaging and Transport chain 1. mRNA comes from nucleus 2. Delivered to E.R (site of synthesis of various Macromolecules) 3. Sent to Golgi apparatus for labelling and delivery out of the cell (or internal) 1 3 2

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