Answer:
Inducer or the ligand
Explanation:
The operon is a sequence of genes present on the DNA which is controlled by the single promoter and are activated or switched on only when required otherwise switched off.
The Operon system is influenced by the molecule present in the environment called the ligand or the inducer like lactose which when binds to the repressor molecule changes the confirmation of the repressor molecule as a result of which the repressor molecule is released from the operator site and the operon is turned on.
Thus, inducer or ligand is correct.
In this exercise we have to use the knowledge of DNA, so we can say that:
Inducer or the ligand
The operon happen a order of genes present on the DNA that exist conditional the single supporter and exist start a function or switched on only when necessary in another way change off.
The Operon structure happen influenced apiece smallest part present in the atmosphere named the ligand or the inducer like sweet substance which when binds to the repressor smallest part changes the ratification of the repressor smallest part as a result of that the repressor smallest part is announced from the one who operates a machine place of activity and the operon is excite.
See more about DNA at brainly.com/question/264225
