Molecular Basis of InheritanceMedium
Question
Which of the following statements about lac-operon is correct?
Options
A.Genes $i,z,y$ and a share single common promoter
B.Galactose can act as an inducer of lac operon
C.Gene $i$ is constitutively expressed
D.Lactose activates repressor to bind to the operator
Solution
Sol. [Key Concept: Regulation of the lac operon]
Galactose cannot act as an inducer of lac operon. Gene i is constitutively expressed in lac operon. Repressor binds to the operator when the lactose is not available. Genes $z,y$ and $a$ are structural genes and have a different promoter than that of the $i$ gene.
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