A) promoter gene
B) structural gene
C) operator gene
D) regulator gene
Correct Answer: D
Solution :
The activity of structural genes (i.e., the genes determining the amino acid sequence of proteins) is controlled by another genes called a regulator gene. The regulator gene carries the genetic code which results in the production of a represser protein. Represser protein prevents the structural genes from being active. The operator and structural genes are collectively known as operon. Operon model of gene control was given by Jacob and Monod in 1961.
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