Zoology - Molecular Basis of Inheritance Question with Solution | TestHub

Operons are segments of genetic material which function as regulated unit or units that can be switched on and switched off. An operon consists of one to several structural genes. (Three in lac operon) these are genes which produce mRNAs for forming polypeptides / proteins/enzymes. Z (produces enzyme$\begin{array}{c}\beta \\ \end{array}$galactosidase for splitting lactose into glucose and galactoside). Y ( produces enzyme galactoside permease required in the entry of lactose ) A (produces enzyme thiogalactoside transacetylase). The three structural genes of the operon produce a single polycistronic mRNA.