Video narration
How do you cook a recipe without bringing the cookbook into the kitchen? In a cell, DNA is the master recipe-stored instructions kept safe while the kitchen works. For one gene, the cell copies those instructions into mRNA, a temporary working copy. DNA stays behind; it is not physically carried to the ribosome. The mRNA travels to a ribosome, the cell's kitchen, which reads the message in order. As it reads, it links amino acids, small building blocks, into a chain according to the recipe. That chain folds into a protein. Here is the key turn: DNA does not become protein. Its instructions are copied and read; the recipe is used, not used up. So, how do you cook without bringing the cookbook in? You use a working copy: DNA remains the master recipe while mRNA guides the ribosome to assemble the protein.