$A$ model that relates repetitive $DNA$ sequences and their transcripts of regulation in eukaryotes was proposed by

An environmental agent that triggers transcription from an operon is a:

Match List-$I$ with List-$II$:

List-$I$	List-$II$
$a$. In lac operon $i$ gene codes for	$i$. Transacetylase
$b$. In lac operon $z$ gene codes for	$ii$. Permease
$c$. In lac operon $y$ gene codes for	$iii$. $\beta$-galactosidase
$d$. In lac operon $a$ gene codes for	$iv$. Repressor

Choose the correct answer from the options given below:

What does the given figure represent?

The $lac \, y$ gene codes for which of the following?

Given below are two statements:
Statement $I$: In lac operon,the repressor protein binds to the promoter region of the operon and prevents $\text{RNA}$ polymerase from transcribing the operon.
Statement $II$: Regulation of lac operon can also be visualized as regulation of enzyme synthesis by its substrate.
In the light of the above statements,choose the correct answer from the options given below: