Which enzyme will be produced in a cell if th | vedclass

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(C) nonsense mutation is a genetic mutation that introduces a premature stop codon in the mRNA sequence,leading to the termination of polypeptide synt

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$\beta$-galactosidase

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(C) nonsense mutation is a genetic mutation that introduces a premature stop codon in the mRNA sequence,leading to the termination of polypeptide synthesis.In the $lac$ operon,the structural genes are arranged in the order $lac Z$,$lac Y$,and $lac A$.These genes code for $\beta$-galactosidase,lactose permease,and transacetylase,respectively.If a nonsense mutation occurs in the $lac Y$ gene,the translation process will be terminated at that point.Consequently,the protein encoded by the $lac Y$ gene (lactose permease) and the protein encoded by the downstream gene $lac A$ (transacetylase) will not be produced.However,the $lac Z$ gene,which is located upstream of the $lac Y$ gene,will be transcribed and translated normally.Therefore,only the $\beta$-galactosidase enzyme will be produced.

$(a)\; i$ gene	$(i)\; \beta-\text{galactosidase}$
$(b)\; z$ gene	$(ii)\; \text{Permease}$
$(c)\; a$ gene	$(iii)\; \text{Repressor}$
$(d)\; y$ gene	$(iv)\; \text{Transacetylase}$

Which enzyme will be produced in a cell if there is a nonsense mutation in the lac $Y$ gene?

Similar Questions

Which enzyme is the expression product of the $y$ gene in the $lac$-operon?

Define the following terms: Regulator gene and Promoter gene.

Match the following genes of the $Lac$ operon with their respective products.
$(a)\; i$ gene $(i)\; \beta-\text{galactosidase}$
$(b)\; z$ gene $(ii)\; \text{Permease}$
$(c)\; a$ gene $(iii)\; \text{Repressor}$
$(d)\; y$ gene $(iv)\; \text{Transacetylase}$

Select the correct option.

During $DNA$ transcription,$mRNA$ is usually single-stranded. However,sometimes an $RNA$ molecule is produced that is complementary to the $mRNA$. This is called ...... and its function is to ...... .

Who proposed the operon model for the first time?

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