Which of the following is true for a repressi | vedclass

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Question

(B) repressible operon is typically involved in anabolic pathways (e.g.,$trp$ operon). In its default state,the operon is $ON$ (transcription occurs).

Vedclass · Accepted Answer

Inactive repressor + Co-repressor = Active repressor

Vedclass · Answer

(B) repressible operon is typically involved in anabolic pathways (e.g.,$trp$ operon). In its default state,the operon is $ON$ (transcription occurs). When the end product (co-repressor) accumulates,it binds to the inactive repressor protein. This binding activates the repressor,which then binds to the operator to turn the operon $OFF$. Therefore,the correct mechanism is: Inactive repressor + Co-repressor = Active repressor.

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

Which of the following is true for a repressible operon?

Similar Questions

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.

At what level does gene expression not occur?

Genes that are involved in turning on or off the transcription of a set of structural genes are called:

Assertion $(A):$ Regulation of $lac$ operon by repressor is referred to as negative regulation.
Reason $(R):$ Repressor protein binds to the operator region and prevents $\text{RNA}$ polymerase from transcribing the operon.

Define the following terms: Regulator gene and Promoter gene.

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