IIT JAM Exam > IIT JAM Questions > A mutation in the operator locus of lac opero...
Start Learning for Free
A mutation in the operator locus of lac operon that confers constitutive expression of β-galactosidase is ________.
- a)cis dominant
- b)trans dominant
- c)co-dominant
- d)dominant negative
Correct answer is option 'A'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Verified Answer
A mutation in the operator locus of lac operon that confers constituti...
A mutation in the operator locus of lac operon that confers constitutive expression of β-galactosidase is
cis dominant
Most Upvoted Answer
A mutation in the operator locus of lac operon that confers constituti...
The lac operon is called a lacOc mutation. This mutation results in the lac repressor protein being unable to bind to the operator region, leading to continuous expression of the lac operon even in the absence of lactose.
The lac operon is a group of genes involved in the metabolism of lactose in bacteria. It consists of three main components: the lacZ, lacY, and lacA genes, which encode for the enzymes β-galactosidase, lactose permease, and thiogalactoside transacetylase, respectively.
The lac repressor protein, encoded by the lacI gene, binds to the operator region of the lac operon and prevents the transcription of the lac genes in the absence of lactose. When lactose is present, it binds to the lac repressor protein, causing a conformational change that prevents it from binding to the operator region. This allows RNA polymerase to bind to the promoter region and initiate transcription of the lac genes.
In a lacOc mutation, a change occurs in the operator region that prevents the lac repressor protein from binding to it, even in the absence of lactose. This constitutive expression of the lac operon means that the lac genes are continuously transcribed and translated, resulting in the production of β-galactosidase, lactose permease, and thiogalactoside transacetylase regardless of the presence or absence of lactose.
The lacOc mutation can be beneficial in certain situations, as it allows bacteria to metabolize lactose even when it is not readily available. However, it can also have negative consequences, as the constant production of the lac enzymes may consume cellular resources and energy.
The lac operon is a group of genes involved in the metabolism of lactose in bacteria. It consists of three main components: the lacZ, lacY, and lacA genes, which encode for the enzymes β-galactosidase, lactose permease, and thiogalactoside transacetylase, respectively.
The lac repressor protein, encoded by the lacI gene, binds to the operator region of the lac operon and prevents the transcription of the lac genes in the absence of lactose. When lactose is present, it binds to the lac repressor protein, causing a conformational change that prevents it from binding to the operator region. This allows RNA polymerase to bind to the promoter region and initiate transcription of the lac genes.
In a lacOc mutation, a change occurs in the operator region that prevents the lac repressor protein from binding to it, even in the absence of lactose. This constitutive expression of the lac operon means that the lac genes are continuously transcribed and translated, resulting in the production of β-galactosidase, lactose permease, and thiogalactoside transacetylase regardless of the presence or absence of lactose.
The lacOc mutation can be beneficial in certain situations, as it allows bacteria to metabolize lactose even when it is not readily available. However, it can also have negative consequences, as the constant production of the lac enzymes may consume cellular resources and energy.
|
Explore Courses for IIT JAM exam
|
|
Similar IIT JAM Doubts
A mutation in the operator locus of lac operon that confers constitutive expression of β-galactosidase is ________.a)cis dominantb)trans dominantc)co-dominantd)dominant negativeCorrect answer is option 'A'. Can you explain this answer?
Question Description
A mutation in the operator locus of lac operon that confers constitutive expression of β-galactosidase is ________.a)cis dominantb)trans dominantc)co-dominantd)dominant negativeCorrect answer is option 'A'. Can you explain this answer? for IIT JAM 2024 is part of IIT JAM preparation. The Question and answers have been prepared according to the IIT JAM exam syllabus. Information about A mutation in the operator locus of lac operon that confers constitutive expression of β-galactosidase is ________.a)cis dominantb)trans dominantc)co-dominantd)dominant negativeCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for IIT JAM 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A mutation in the operator locus of lac operon that confers constitutive expression of β-galactosidase is ________.a)cis dominantb)trans dominantc)co-dominantd)dominant negativeCorrect answer is option 'A'. Can you explain this answer?.
A mutation in the operator locus of lac operon that confers constitutive expression of β-galactosidase is ________.a)cis dominantb)trans dominantc)co-dominantd)dominant negativeCorrect answer is option 'A'. Can you explain this answer? for IIT JAM 2024 is part of IIT JAM preparation. The Question and answers have been prepared according to the IIT JAM exam syllabus. Information about A mutation in the operator locus of lac operon that confers constitutive expression of β-galactosidase is ________.a)cis dominantb)trans dominantc)co-dominantd)dominant negativeCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for IIT JAM 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A mutation in the operator locus of lac operon that confers constitutive expression of β-galactosidase is ________.a)cis dominantb)trans dominantc)co-dominantd)dominant negativeCorrect answer is option 'A'. Can you explain this answer?.
Solutions for A mutation in the operator locus of lac operon that confers constitutive expression of β-galactosidase is ________.a)cis dominantb)trans dominantc)co-dominantd)dominant negativeCorrect answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for IIT JAM.
Download more important topics, notes, lectures and mock test series for IIT JAM Exam by signing up for free.
Here you can find the meaning of A mutation in the operator locus of lac operon that confers constitutive expression of β-galactosidase is ________.a)cis dominantb)trans dominantc)co-dominantd)dominant negativeCorrect answer is option 'A'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
A mutation in the operator locus of lac operon that confers constitutive expression of β-galactosidase is ________.a)cis dominantb)trans dominantc)co-dominantd)dominant negativeCorrect answer is option 'A'. Can you explain this answer?, a detailed solution for A mutation in the operator locus of lac operon that confers constitutive expression of β-galactosidase is ________.a)cis dominantb)trans dominantc)co-dominantd)dominant negativeCorrect answer is option 'A'. Can you explain this answer? has been provided alongside types of A mutation in the operator locus of lac operon that confers constitutive expression of β-galactosidase is ________.a)cis dominantb)trans dominantc)co-dominantd)dominant negativeCorrect answer is option 'A'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice A mutation in the operator locus of lac operon that confers constitutive expression of β-galactosidase is ________.a)cis dominantb)trans dominantc)co-dominantd)dominant negativeCorrect answer is option 'A'. Can you explain this answer? tests, examples and also practice IIT JAM tests.
|
|
Explore Courses for IIT JAM exam
|
|
Suggested Free Tests
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup