In the lac operon,if a nonsense mutation occu | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) The $lac$ operon consists of three structural genes: $lac\, z$,$lac\, y$,and $lac\, a$.$lac\, z$ codes for $\beta$-galactosidase,$lac\, y$ codes f

Vedclass · Accepted Answer

$\beta$-galactosidase

Vedclass · Answer

(A) The $lac$ operon consists of three structural genes: $lac\, z$,$lac\, y$,and $lac\, a$.$lac\, z$ codes for $\beta$-galactosidase,$lac\, y$ codes for permease,and $lac\, a$ codes for transacetylase.$A$ nonsense mutation in a gene introduces a premature stop codon,leading to the termination of translation for that specific polypeptide.Since $lac$ operon genes are transcribed as a single polycistronic mRNA,a mutation in $lac\, y$ will prevent the synthesis of functional permease.However,the translation of the upstream gene $lac\, z$ is unaffected,so $\beta$-galactosidase will still be synthesized.The downstream gene $lac\, a$ translation is typically affected by the nonsense mutation in the upstream $lac\, y$ gene due to the nature of polycistronic translation.Therefore,only $\beta$-galactosidase will be synthesized.

In the $lac$ operon,if a nonsense mutation occurs in the $lac\, y$ gene,which enzymes will be synthesized?

Similar Questions

In eukaryotic organisms,gene expression regulation cannot occur at which of the following levels?

What is an operon?

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

In the $lac$ operon,which enzyme$(s)$ will be produced in the cell if there is a nonsense mutation in the $lac$ $y$ gene?

The lactose present in the growth medium of bacteria is transported to the cell by the action of

Vedclass Test Series

Exam Paper Generator

Online Exam Module