role of the rough endoplasmic reticulum and golgi apparatus

• step 1 :  Transcription of DNA to mRNA (RNA polymerase makes a complimentary mRNA strand using the DNA strand as a template)
• step 2 a: mRNA leaves nucleus
• step 2 b: Translation of mRNA to protein (ribosomes bind to the mRNA, anticodons on tRNA molecules bind to the complimentary mRNA codons. tRNA molecules carry specific amino acids. Ribosomes build a protein.)
• step 3 : Protein made on ribosomes enter rough endoplasmic reticulum
• step 4 : Protein moves through the endoplasmic reticulum assuming 3D shape on route
• step 5 : Vesicles pinched off the rough endoplasmic reticulum contain the protein
• step 6 : Vesicles from the rough endoplasmic reticulum form the flattened sacs of the Golgi apparatus
• step 7 : Proteins are modified within the Golgi apparatus
• step 8 : Vesicles pinched off the Golgi apparatus contain the modified protein
• step 9 : Vesicle fuses with cell surface membrane releasing protein, such as extracellular enzymes