A) inducer of lac operon
B) represser of lac operon
C) hydrolysis of disaccharide
D) permease
Correct Answer: B
Solution :
The lac operon consists of one regulatory gene (the i-gene) and three structural genes (z, y and a). The z-gene codes for the represser of the lac operon. The %-gene codes for P-galactosidase ( \[\beta\] -gal), which is primarily responsible for the hydrolysis of the disaccharide, lactose into its monomeric units, galactose and glucose. The y-gene codes for permease, which increases permeability of the cell to \[\beta\] -galactosides. The a-gene encodes a transacetylase.
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