Answer:
A group of genes including an operator, a common promoter and one or more structural genes that are controlled as a unit to produce messenger RNA (mRNA).
The lac operon consists of one regulatory gene (the i gene - here the term i does not refer to inducer, rather it is derived from the word inhibitor) and three structural genes (z,y and a). The i gene codes for the represser of the lac operon. The z gene codes for beta-galactosidase (\[\beta \]-gal), which is primarily responsible for the hydrolysis of the disaccharide, lactose into its monomeric units, galactose and glucose. They gene codes for permease, which increases permeability of the cell to \[\beta \]-galactosides. The a gene encodes of transacetylase.
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