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4.1: Central Dogma of Molecular Biology

Difficulty Level: At Grade Created by: CK-12
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Is it always DNA to RNA to proteins?

The central dogma of molecular biology. Coined by Francis Crick. And in his own words, "I called this idea the central dogma, for two reasons, I suspect. I had already used the obvious word hypothesis in the sequence hypothesis, and in addition I wanted to suggest that this new assumption was more central and more powerful."

Central Dogma of Molecular Biology

Your DNA, or deoxyribonucleic acid, contains the genes that determine who you are. How can this organic molecule control your characteristics? DNA contains instructions for all the proteins your body makes. Proteins, in turn, determine the structure and function of all your cells. What determines a protein’s structure? It begins with the sequence of amino acids that make up the protein. Instructions for making proteins with the correct sequence of amino acids are encoded in DNA.

DNA is found in chromosomes. In eukaryotic cells, chromosomes always remain in the nucleus, but proteins are made at ribosomes in the cytoplasm. How do the instructions in DNA get to the site of protein synthesis outside the nucleus? Another type of nucleic acid is responsible. This nucleic acid is RNA, or ribonucleic acid. RNA is a small molecule that can squeeze through pores in the nuclear membrane. It carries the information from DNA in the nucleus to a ribosome in the cytoplasm and then helps assemble the protein. In short:

DNA → RNA → Protein

Discovering this sequence of events was a major milestone in molecular biology. It is called the central dogma of molecular biology.  The two processes involved in the central dogma are transcription and translation.




  • The central dogma of molecular biology states that DNA contains instructions for making a protein, which are copied by RNA.
  • RNA then uses the instructions to make a protein.
  • In short: DNA → RNA → Protein, or DNA to RNA to Protein.


  1. State the central dogma of molecular biology.
  2. What are transcription and translation?
  3. Explain the central dogma of molecular biology.


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    amino acid

    Small molecule that is a building block (monomer) of proteins.

    central dogma of molecular biology

    DNA → RNA → Protein; the rule that states that the information in DNA is transcribed into RNA and translated into protein.

    DNA (deoxyribonucleic acid)

    Double-stranded nucleic acid that makes up genes and chromosomes; the hereditary material.


    Organic compound made up of amino acids.


    (ribonucleic acid): Single-stranded nucleic acid involved in protein synthesis.


    Process in which genetic instructions in DNA are copied to form a complementary strand of mRNA.


    Process in which genetic instructions in mRNA are read to synthesize a protein.

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    Date Created:
    Feb 24, 2012
    Last Modified:
    Sep 04, 2016
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