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Lac Operon

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Question

Select the incorrect statement given below about lac operon when Lactose is present in the medium.

A

Gene – LacA gets transcribed into mRNA which produces

β

-galactosidase

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B

Inducer-Repressor complex is formed

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C

Lactose inactivates repressor protein

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D

RNA polymerase transcribe Z-gene, Y-gene and A-gene

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Solution

The correct option is A Gene – LacA gets transcribed into mRNA which produces $β$ -galactosidase
Lac A gene gets transcribed to an mRNA which produces transacetylase.

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Similar questions

Q. Read the statements regarding the lac operon and choose the correct option
I. An inducer regulates the switching on and off of lac operon.
II.Repressor protein dissociates from operator region and prevents RNA polymerase from transcribing the operon.
III. In the presence of lactose, the repressor is activated by interaction with lactose.
IV. RNA polymerase has access to the promoter and transcription proceeds only when the repressor is inactivated.

Q. The structural genes of lac operon transcribe mRNA which is

Q. Match the following genes of the Lac operon with their respective products.

a.	i gene	i.	$β -$ galactosidase
b.	z gene	ii.	Permease
c.	a gene	iii.	Repressor
d.	y gene	iv.	Transacetylase

Q. Operon is a coordinated group of genes that function together as a unit for a metabolic pathway. How many statements below are correct with respect to lac operon?
i) Glucose or galactose may bind with the repressor and inactivate it.
ii) In the absence of lactose, the repressor binds with the operator region.
iii) The Z-gene codes for permease.
iv) I- gene codes for repressor protein

Q. Select the two correct statements out of the four (a to d) given below about lac–operon:
a) Allolactose may bind with repressor and inactivate it.
b) In the absence of lactose, the repressor binds with the operator regions.
c) The z-gene codes for permease.
d) The i-gene codes for activator protein.

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