GOLGI COMPLEX - In some cases, the carbohydrates and other...

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GOLGI COMPLEX Factory for packaging proteins Consists of stacks of flattened membranous sacs that may be distended in certain regions because they are filled with cell products. The golgi complex processes, sorts, modifies, and packages proteins. Proteins that pass through the golgi are: secreted from the cell plasma membrane proteins and proteins routed to other intracellular organelles pass through the golgi . Such proteins are synthesized on ribosomes associated with the RER. From the ER they are transported to the Golgi complex in small membrane-bound vesicles formed from the ER membrane. These vesicles then fuse with the membranes of the Golgi complex. The proteins then pass through the separate layers of the Golgi complex moving by way of membrane transport vesicles. During their passage- proteins are modified in different ways Carbohydrates are often added here or previously added carbohydrates are modified.
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Unformatted text preview: In some cases, the carbohydrates and other modifications act as "sorting signals" allowing the GOLGI to route the protein to different parts of the cell. The GOLGI of plant cells also produces some of the extracellular polysaccharides used in components of the cell wall. The Golgi Complex has a distinct polarity. The cis face of the golgi {closest to the nucleus} is the site where membrane-bound vesicles from the ER first fuse. The golgi stack refers to the middle portion of the golgi. The trans face of the golgi refers to the portion of the golgi closest to the plasma membrane and serves as the site where membrane-bound vesicles bud and then exit the golgi complex. The Golgi also performs important functions in non-secreting cells by packaging intracellular digestive enzymes in the little organelles known as lysosomes....
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This document was uploaded on 11/03/2011 for the course BIOLOGY MCB2010 at Broward College.

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