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.
