1. DNA as the Blueprint: DNA contains the instructions for building all the proteins your body needs. These instructions are organized into genes, which are specific segments of DNA.
2. Transcription: The gene for a specific protein is first transcribed into a molecule called messenger RNA (mRNA). This process involves copying the DNA sequence of the gene into the mRNA molecule.
3. Translation: The mRNA molecule then travels out of the nucleus to the ribosomes, which are the protein-building machinery of the cell. At the ribosome, the mRNA sequence is translated into a chain of amino acids.
4. Codons: The mRNA sequence is read in groups of three nucleotides called codons. Each codon corresponds to a specific amino acid.
5. Amino Acid Chain: The ribosome uses the codons in the mRNA as a guide to assemble the amino acids in the correct order, forming a polypeptide chain.
6. Folding: The polypeptide chain then folds into a specific three-dimensional shape, which is determined by the amino acid sequence and interactions between them. This shape allows the protein to perform its specific function.
In summary:
- DNA contains the genetic code, which provides the blueprint for protein synthesis.
- Transcription copies the DNA sequence into mRNA.
- Translation reads the mRNA codons to assemble the correct amino acid sequence.
- The resulting polypeptide chain folds into a functional protein.
