A - Rough Endoplasmic Reticulum - sheet-like internal membrane filled with ribosomes where protein synthesis takes place
B - Cytoplasm - gel-like matrix that contains all the organelles
C - Golgi Complex - collects molecules, packages them inside vesicles, stores the formed molecules or distibutes them in the cell.
D - Nucleolus - produces ribosomes
E - Nucleus - the brain of the cell; controls all the processes in the body
F - Mitochondrion - where oxidative metabolism happens, produces energy from food
G - Smooth endoplasmic reticulum -tubular shaped internal membrane where lipids and steroids are stored
H - Peroxisome - contains important enzymes to be used in various metabolic reactions
I - Plasma Membrane - encloses the contents of the cell, made up of lipids and proteins
The process is called Transcription (mRNA) which is messenger RNA. It occurs in the nucleus of the cell. However, after being copied the RNA leaves the nucleus. Hope it helps.