Operon is

A

Sequence of three nitrogen bases determining single amino acid

B

A set of closely placed gene regulating a metabolic pathway in prokaryotes

C

Segment of DNA specifying a polypeptide

D

Gene responsible for switching on and switching off of other genes

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The correct Answer is:
B
Operon is a set of closely placed genes regulating a metabolic pathway in prokaryotes.
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A2Z-MOLECULAR BASIS OF INHERITANCE-Section A: Topicwise Questions (topic 7: Regulation Of Gene Expression) The Lac Operon
  1. Recognise the figure and find out the correct matching.

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

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

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

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  5. In operon model, regulator gene functions as

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  6. Operon contains

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

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  8. Operon is

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

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  10. Match the column and choose the correct option.

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  11. Lac operon concept was proposed by

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

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  13. In Lac-operon, repressor protein binds to

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

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

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  16. Sequence of structural genes of lac operon is

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  17. What is correct gene expression pathway ?

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  18. Lac operon 'inducer lactose' serves as an anzyme substrate for anzyme

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  19. In lac operon model, lactose functions as

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  20. In lac operon genes a, i, y and z code for

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