genetic question -

[ArchivalUser]

Samira

A prokaryotic operon codes for two enzymes and one regulatory protein . the operon is expressed only in the presence of a particular sugar . Initial mapping of the operon has differentiated the non transcribed sequence from the transcribed sequences.Deletion of 10 nucleotides from one of the nontranscribed sequences results in the transcription of the operon in both the presence and absence of the sugar. Which of the following sequences was most likely affected?
a.activator binding site
b.activator gene
c.operator
d.promoter
e.repressor gene
Please explain.

[ArchivalUser]

14*

c. operator

In the present of sugar, the repressor could not bind to operator for sure because the action of the sugar; in the absence of sugar, repressor factor also can not bind to operator because it has gone.

[ArchivalUser]

Samira

can anyone please explain a bit more about it?
thanx