A gene of operon which forms the repressor protein is

Structural

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Promoter

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Operator

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Regulator

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Open in App

Solution

The correct option is D Regulator
Operon
Operon is a cluster of genes which have a common promoter and are transcribed as a single polycistronic mRNA. Examples of operon include $l a c$ operon, $t r p$ operon, $a r a$ operon, $h i s$ operon, $v a l$ operon etc.
Operator
Operator is a genetic sequence that lies adjacent downstream to the promoter region of DNA and regulates the synthesis of RNA from the downstream structural genes.
Promoter
Promoter is the segment of DNA lying upstream to the operator and provides a site for initial binding of RNA polymerase to proceed with transcription.
Regulator gene
A lac operon has a regulator gene ( $l a c$ $i$ ). The i gene is responsible for coding the repressor protein of the lac operon.
Structural gene
A $l a c$ operon has three structural genes ( $l a c$ $z$ , $l a c$ $y$ and $l a c$ $a$ ). The structural genes code for specific enzymes: lac z codes β-galactosidase, lac y codes permease and lac a codes transacetylase.
Final answer
(C) Regulator

Suggest Corrections

Similar questions

\begin{matrix} C o l u m n I & C o l u m n I I p . R e g u l a t o r g e n e & i . B i n d i n g s i t e f o r r e p r e s s o r p r o t e i n q . O p e r a t o r g e n e & i i . C o d e (s) f o r t h e p r o t e i n o f t h e e n z y m e s r . P r o m o t e r g e n e & i i i . C o d e (s) f o r r e p r e s s o r p r o t e i n s . S t r u c t u r a l g e n e s & i v . B i n d i n g S i t e f o r R N A p o l y m e r a s e \end{matrix}

\begin{matrix} C o l u m n I & C o l u m n I I p . R e g u l a t o r g e n e & i . B i n d i n g s i t e f o r r e p r e s s o r p r o t e i n q . O p e r a t o r g e n e & i i . C o d e (s) f o r t h e p r o t e i n o f t h e e n z y m e s r . P r o m o t e r g e n e & i i i . C o d e (s) f o r r e p r e s s o r p r o t e i n s . S t r u c t u r a l g e n e s & i v . B i n d i n g S i t e f o r R N A p o l y m e r a s e \end{matrix}

Join BYJU'S Learning Program

Explore more

Join BYJU'S Learning Program