Protein Secretion

Protein Secretion - ProteinSecretion HigherBiology (rough...

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Protein Secretion Higher Biology
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Rough Endoplasmic Reticulum (rough  ER) System of flattened sacs and tubules Encrusted with ribosomes on the outer surface if  their membranes Continuous with outer nuclear membrane Provides a large surface area for chemical reactions Pathway for transport of materials
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Golgi Apparatus Group of flattened fluid-filled sacs 1. Vesicles  containing newly synthesised protein  pinched off from rough ER 2. Fuse with outermost sac of Golgi apparatus 3. Protein passed from sac to sac by means of vesicles 4. Golgi apparatus  processes  protein  -e.g. adds a carbohydrate  -form a  glycoprotein
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Exocytosis Vesicles containing finished product -mucus -digestive enzyme -hormone Pinched off at end of Golgi apparatus Vesicles move towards cell membrane and fuse with it Contents of vesicle discharged to outside
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Protein Secretion Golgi bodies especially numerous and active in  secretory cells -gastric gland cells in stomach walls -mucus  -pepsin -pancreas -insulin
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Elements in a protein Carbon Hydrogen Oxgen Nitrogen (sulphur)
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This note was uploaded on 11/07/2011 for the course BIOLOGY 100 taught by Professor Staff during the Winter '08 term at BYU.

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Protein Secretion - ProteinSecretion HigherBiology (rough...

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