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Protein Secretion PowerPoint Presentation

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Description : Ppt Presentation on Protein Secretion which is created by Hina Hashmi and available for free download Protein Secretion powerpoint presentation.

Tags : Protein

Published on : Aug 18, 2018
Views : 1069 | Downloads : 0

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Protein Secretion Presentation Transcript

Slide 1 -

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 Vesicles containing newly synthesised protein pinched off from rough ER Fuse with outermost sac of Golgi apparatus Protein passed from sac to sac by means of vesicles 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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Structure of a protein

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Quaternary structure of proteins 3 different types -fibrous proteins -globular proteins -conjugated proteins

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Fibrous proteins Several spiral-shaped polypeptide molecules Linked in parallel by disulphide bridges Protein has a rope-like structure

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Globular proteins Several polypeptide chains folded roughly into a spherical shape like a tangled ball of string Enzymes are globular proteins Also vital component in cell and sub-cellular membranes

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Hormones Chemical messengers Globular protein Exert a specific effect on tissues

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Antibodies Y-shaped globular proteins Made by lymphocytes Defend body against antigens

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Conjugated proteins Globular protein associated with a non-protein chemical Glycoprotein -protein and carbohydrate -mucus

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Haemoglobin Oxygen-transporting pigment in blood Conjugated protein -globular protein globin -haem (non-protein containing iron)

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