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Which organelle modifies cell products, packages them for distribution, and then may turn into vesicles and bubble off the surface of the cell?

This would be the Golgi apparatus.It exists in separate 'sacs' of membranes, known as cisternae, and can be easily identified in TEM micrographs as the structure that looks like it is a stack of pancakes. (Not particularly biological language, but there you go.) It's currently believed that each cisterna has a different function, but there is also the argument that each cisterna 'matures' and changes place in the Golgi - i.e. that it is a dynamic 'belt' of modification. Hope that solves it!Fran 
18 December 2014
The Golgi (but not always). In some cases the ER and RER can export products. 
Ryan V.
25 December 2014
golgi body
27 December 2014
Golgi body. One would need to describe structure as well as function.
31 December 2014
Golgi Apparatus
Harry W.
30 January 2015
The golgi apparatus is responsible for modifying and packaging lipids and proteins into vesicles ready for deployment to the outer membrane. 
Adam S.
24 March 2015
the Golgi apparatus 
01 July 2015
heres a very fine answer to your question :Golgi apparatus - Protein 'packaging plant' - A membrane structure found near nucleus - Composed of numerous layers forming a sac 
22 July 2015
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