Q.
Read the following statements with respect to lac operon, and select the correct option.
A. It has three structural genes.
B. Glucose can act as an inducer.
C. Repressor protein acts in the presence of lactose.
D. Repressor is synthesized by the regulator gene.
Solution:
Jacob and Monod proposed the operon model of prokaryotic gene regulation.
Operons are groups of genes coding for related proteins and are arranged in units. Instead, it is the part of the DNA which act as a single regulated unit having one or more structural gene, an operator, a promoter, and a regulator gene.
The lac operon does not work in the presence of glucose, and lactose binds to repressor protein to deactivate it. Thus lactose acts as an inducer and hence named inducible operon.
Operons are groups of genes coding for related proteins and are arranged in units. Instead, it is the part of the DNA which act as a single regulated unit having one or more structural gene, an operator, a promoter, and a regulator gene.
The lac operon does not work in the presence of glucose, and lactose binds to repressor protein to deactivate it. Thus lactose acts as an inducer and hence named inducible operon.