Here's why:
* DNA contains the genetic code: DNA holds the instructions for building proteins, written in the form of genes.
* Transcription happens in the nucleus: The process of transcribing DNA into RNA (messenger RNA or mRNA) occurs within the nucleus.
* mRNA travels to the cytoplasm: Once mRNA is created, it exits the nucleus and travels to the ribosomes in the cytoplasm.
* Translation at ribosomes: Ribosomes use the mRNA template to assemble amino acids into proteins.
Therefore, DNA stays in the nucleus and serves as the blueprint for protein synthesis, while the mRNA carries the instructions to the ribosomes for protein assembly.
