Answer:
Step-by-step explanation:
There are two types of endoplasmic reticulum: rough endoplasmic reticulum (rough ER) and smooth endoplasmic reticulum (smooth ER), both are present in plant and animal cells.
The rough ER receives its name because ribosomes are attached to the membrane of the ER. It's inolved with the production, folding, quality control and despatch of some proteins. The process of protein synthesis starts when mRNA moves from the nucleus to a ribosome on the surface of the RER, the ribosome builds the amino acid chain that is then pushed into the cisternal space of the RER. When the proteins are complete, they collect and the RER pinches off a vesicle that can move to the cell membrane or the Golgi apparatus.
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