Explanation:
After the translation of mRNA by ribosomes, the result is an amino acid chain also called a polypeptide. This polypeptide enters the lumen of the Rough Endoplasmic Reticulum where it is folded into the requisite 3D structure with the help of chaperone proteins. The protein is then taken to the Golgi apparatus where it is packaged and ‘tagged’ and transported to the cell membrane, via vessicles, for excretion outside of the cell. This applies to proteins such as protein hormones. Mitochondria provides the ATPs required to power these processes.
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