Which of the following statements about the l | vedclass

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(A) $1$. The $lac$ operon consists of a regulatory gene $(i)$, a promoter $(p)$, an operator $(o)$, and three structural genes $(z, y, a)$.$2$. The ge

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Gene $i$ is constitutively expressed

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(A) $1$. The $lac$ operon consists of a regulatory gene $(i)$, a promoter $(p)$, an operator $(o)$, and three structural genes $(z, y, a)$.$2$. The gene $i$ codes for the repressor protein of the $lac$ operon. It is constitutively expressed, meaning it is always transcribed at a constant rate regardless of the presence or absence of lactose.$3$. Lactose acts as an inducer. It binds to the repressor protein, preventing it from binding to the operator, which allows transcription to proceed.$4$. Genes $z, y,$ and $a$ are transcribed together as a single polycistronic mRNA under the control of a single promoter, but gene $i$ has its own separate promoter.$5$. Therefore, the statement that gene $i$ is constitutively expressed is correct.

Which of the following statements about the $lac$ operon is correct?

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