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  • The lac operon consists ofOption: 1 Four regulatory genes onlyOption: 2 One regulatory gene

The lac operon consists of

Option: 1

Four regulatory genes only


Option: 2

One regulatory gene and three structural genes


Option: 3

Two regulatory genes and two structural genes


Option: 4

Three regulatory genes and three structural genes


Answers (1)

best_answer

The Lac operon consists of a regulator gene, an operator gene and three structural genes. The three structural genes are LacZ, LacY and LacA. LacZ encodes β-galactosidase (LacZ), an intracellular enzyme that cleaves the disaccharide lactose into glucose and galactose. LacY codes for a β-permease that pumps lactose into cells. Lac A codes for a beta-transacetylase that removes toxic substances from cells.Regulatory genes produce mRNA which is translated into a repressor. The repressor binds to the operator and blocks expression of the structural gene in the absence of the inducer. In the presence of an inducer, the repressor binds to the inducer, leaving the operator unblocked, allowing expression of the structural gene. An operator gene is a region of the DNA sequence that attaches to a repressor molecule and stops expression of the structural gene. Hence, option 2 is correct

 

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