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Lac Operon – jj

Lac Operon

NDSU Virtual Cell Animations Project animation ‘Lac Operon’. For more information please see http://vcell.ndsu.edu/animations

The Lac Operon is an example of an inducible system of gene expression. Its default state is to be inactive. Only when the right catalyst is added to the system, in this case the sugar lactose, is the process activated, allowing the genes in question to be expressed.


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  1. lmao youre still getting comments about the allolactose thing :/ honestly, for my course (A level bio) you just need lactose. this is a three min vid, and if you want smth more in depth and of a higher qualification a 3 min vid aint it

  2. 1:30 Wrong. Beta gal first transformers some lactose into an isomer of lactose: alllactose which binds to the repressor molecule causing a conformation al change in its shape. The repressor cannot bind to the operator and thus RNA polymerase is free to transcribe the gene coding for lactose metabolism enzymes.

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