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what is operon ?

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what is operon ?

    • Posted by Dilraj Kaur 6 years, 3 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Yogita Ingle 6 years, 3 months ago

    Lac operon

    • Lac refers to lactose in lac operon.
    • The lac operon consists of one regulatory gene the i gene which codes for the repressor of the lac operon and three structural genes (z, y, and a).
    • The z gene codes for beta-galactosidase (β-gal), which hydrolyses disaccharide, lactose into galactose and glucose.
    • The y gene codes for permease, which increases permeability of the cell to β-galactosides.
    • The a gene encodes a transacetylase.
    • Lactose is termed as inducer as lactose is the substrate for the enzyme beta-galactosidase and it regulates switching on and off of the operon.

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