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Which of the following events would occu...

Which of the following events would occur in 'Lac-operon of E. coil when growth medium has high concentration of lactose?

A

Structural genes fail to produce polycistronic mRNA

B

Repressor protein binds to RNA polymerase and prevents translation

C

Repressor protein attaches to the promoter sequence and represses the operator

D

Inducer molecule binds to repressor protein and RNA polymerase binds to promoter sequence.

Text Solution

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The correct Answer is:
D
`**" "`In the presence of an inducer, such as lactose or allolactose, the repressor is inactivated by interaction with the inducer.
`**" "`This allows RNA polymerase access to the promoter and transcription proceeds.
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A2Z-MOLECULAR BASIS OF INHERITANCE-Section A: Topicwise Questions (topic 7: Regulation Of Gene Expression) The Lac Operon
  1. In prokaryotes, the predominant site (or primary step) of control of g...

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  2. Read the statements regarding the lac operon and choose the correct op...

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  3. Which of the following events would occur in 'Lac-operon of E. coil wh...

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  4. Match the components of lac-operon of Escherichia coli ad find out the...

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  5. Recognise the figure and find out the correct matching.

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  6. The lac operon is turned on when allolactose molecules bind to

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  7. An environmental agent that triggers transcription from an operon is a...

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  8. The genes are responsible for growth and differentiation in an organis...

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  9. In operon model, regulator gene functions as

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  10. Operon contains

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  11. In Escherichia coli, the product of i gene combines with

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  12. Operon is

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  13. Escherichia coli with mutated z gene of lac operon cannot grow in medi...

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  14. Match the column and choose the correct option.

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  15. Lac operon concept was proposed by

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  16. Escherichia coli growing on medium having glucose is transferred to la...

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  17. In Lac-operon, repressor protein binds to

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  18. A gene of operon which forms the repressor protein is

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  19. Operon model of gene regulation and organisation of prokaryotes was pr...

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  20. Sequence of structural genes of lac operon is

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