Question

What repackages proteins into forms the cell can use, expel, or keep stored?

Answer 1

It's the Golgi Body or complex/apparatus

Explanation:

Proteins are involved in series of production involving the endomembrane system (endo- inner + membrane): from the encoded genetic material inside the nucleus down to the plasma/cell membrane. Proteins are synthesized inside the ROUGH ENDOPLASMIC RETICULUM (RER) then it is elaborately modified and repackage inside the Golgi Body (GB), which is made up of folded and stacked membrane-bound structures (covered) called CISTERNAE[check link for more info] (https://biologywise.com/organelles-their-functions) .

Proteins are received from the CIS-FACE of the GB then altered and are finally repackaged and shipped in the TRANS-FACE. The proteins are now bounded inside a structure called vesicle (or transport vesicle) which is sent to the different parts of the cell or outside the cell depending on the functions and uses.