What is the process of turning DNA sequences into functional proteins?

The process of turning DNA sequences into functional proteins is called protein synthesis, which involves two stages: transcription and translation.

Protein synthesis is a fundamental biological process that occurs within the cells of organisms. It is the method by which the genetic information encoded in DNA is used to produce proteins, the workhorses of the cell that perform a wide variety of functions.

The first stage of protein synthesis is transcription. During transcription, an enzyme called RNA polymerase binds to a specific region of the DNA molecule. This region is the gene that codes for the protein to be synthesised. The RNA polymerase then unzips the DNA double helix and uses one strand as a template to synthesise a complementary strand of messenger RNA (mRNA). This mRNA molecule is a copy of the gene, but it is made of RNA rather than DNA.

The mRNA molecule then leaves the nucleus of the cell and moves into the cytoplasm, where it binds to a ribosome. This is where the second stage of protein synthesis, translation, takes place. During translation, the ribosome reads the sequence of nucleotides in the mRNA molecule in groups of three, known as codons. Each codon corresponds to a specific amino acid. Transfer RNA (tRNA) molecules, each carrying a specific amino acid, bind to the mRNA at the codon that matches their anticodon. The ribosome then links the amino acids together in the order specified by the mRNA molecule, creating a polypeptide chain. This chain folds into a specific shape to form a functional protein.

In summary, protein synthesis is a two-step process that involves transcription and translation. It is the way in which the genetic information in DNA is used to produce functional proteins. This process is fundamental to the functioning of all living organisms.