BIO 202 Lecture 10

BIO 202 Lecture 10 - Cell Structure: Organelles 2 Golgi...

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Cell Structure: Organelles 2
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Golgi apparatus Membranous structure Center for storage, modification, sorting, and transport of ER products Looks like several stacks of flat membrane pockets Cis-face receives incoming vesicles from the ER Trans-face sends off vesicles to other parts of the cells
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Golgi apparatus • What is in the vesicles? – Proteins modified by the ER and Golgi – Modified phospholipids • Where do the vesicles go? – To specific parts of the cell • This targeting occurs by special mechanisms involving specific targeting signals on protein molecules. Vesicles can fuse with the plasma membrane, go to lysosomes etc. (vesicles containing molecules to be recycled go to lysosomes)
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Lysosomes • They are membrane vesicles filled with digestive enzymes (proteases, nucleases) • They are found in animal cells • They have a pH of ~5.0 – Hydrolytic enzymes of lysosomes are active at low pH and inactive at neutral pH of the cell cytosol (if the lysosome breaks, its enzymes become inactive and
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BIO 202 Lecture 10 - Cell Structure: Organelles 2 Golgi...

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