protein production

step one

genes are transcribed into mRNA

step two

mRNA leaves the nucleus through the nuclear pores

step three

at the ribosomes, the mRNA is translated to make proteins that are excreted or attached to the cell membrane. the free ribosomes in the cytoplasm make proteins that stay in the cytoplasm

step four

new proteins that are fed into the RER cisternae are folded and processed eg to form glycoproteins

step five

proteins are transported from the ER to the golgi apparatus in vesicles

step six

at the golgi apparatus, the proteins may undergo further processing, eg snipping of the glycoprotein