DNA → RNA → Protein
This means that genetic information is first encoded in DNA, then transcribed into RNA, and finally translated into protein.
Transcription and Translation are the key processes that link these steps:
* Transcription: This is the process of copying the genetic information from DNA into RNA. It occurs in the nucleus of eukaryotic cells and in the cytoplasm of prokaryotic cells. The enzyme RNA polymerase reads the DNA sequence and creates a complementary RNA molecule, called messenger RNA (mRNA).
* Translation: This is the process of converting the information in mRNA into a protein. It occurs in ribosomes, which are cellular machines found in the cytoplasm. The mRNA molecule is read by the ribosome in groups of three nucleotides called codons. Each codon specifies a particular amino acid. The ribosome then links these amino acids together in a chain, forming a protein.
Therefore, transcription and translation are essential for the central dogma to function:
* Transcription allows the genetic information in DNA to be accessed and copied for use in protein synthesis.
* Translation converts the information in mRNA into the functional protein molecules that perform various roles in the cell.
In summary:
* The central dogma describes the flow of genetic information from DNA to RNA to protein.
* Transcription is the process that copies DNA into RNA.
* Translation is the process that converts RNA into protein.
* Together, transcription and translation ensure the faithful expression of genetic information from DNA into functional proteins, driving cellular processes.
