Molecular Basis of Inheritance Question 150

150. The lac operon is an example of

[1995]

(a) arabinose operon

(b) inducible operon

(c) repressible operon

(d) overlapping genes

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Answer : b

Hints & Solution

(b) The lac operon consists of a promotor gene, an operator gene and structural genes. There are three structural genes designated as $z, y$ and a, which code for the enzymes $\beta$-galactosidase, lac permease and transacetylase respectively. It is an example of inducible operon.



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