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  • Ezgi Hüseyinoğlu

    July 28, 2021 at 7:48 am
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    Hey @ari , thank you for your response to my other questions, I really appreciate it.

    I also want to ask you about the “lac operon”. What is this thing? It has never came across to me while studying or maybe I do not remember. Do we need to know about this and how it works for the IMAT?

    Juanita A voted up
  • Ari Horesh

    July 28, 2021 at 8:47 am
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    Hey! Yes, the lac operon and the tryptophan operon are both examples of bacteria’s unique way to either inhibit or stimulate the transcription of a specific sequence of genes, only if it is needed in the surrounding. In High-schools they usually give these two operons as examples for inducible and repressible operons, so it’s also part of the IMAT syllabus.

    In our example, if lactose is abundant in the surrounding, the bacteria will want to break down the Lactose *which is a disaccharide of glucose and galactose, into monomers. In order to do so, you need specific enzymes that you can find the DNA for on the lac operon.

    The general idea is that you only want to transcript the genes of X enzyme if you actually need it, the operon system makes sure that you won’t waste energy by creating unnecessary enzymes.

    Here is a great video explaining operons.

    • This reply was modified 1 month, 3 weeks ago by  Ari Horesh.
    • This reply was modified 1 month, 3 weeks ago by  Ari Horesh.

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