The lac operon consists of:

One regulatory gene and three structural genes (z, y, a)

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Three regulatory genes and one structural gene

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One regulatory gene and many structural genes

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One regulatory gene and one structural gene

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Solution

The correct option is A One regulatory gene and three structural genes (z, y, a)
The two French scientists, Jacob and Monod proposed the lac operon model of E. coli. The lac operon (an inducible operon) contains a promoter, an operator, a regulator gene and three structural genes z, y and a.

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