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In E.coli, the lac operon gets switched ...

In E.coli, the lac operon gets switched on when :

A

Lactose is present and it binds to the repressor

B

Repressor binds to operator

C

RNA polymerase binds to the operator

D

Lactose is present and it binds to RNA polymerase

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The correct Answer is:
A
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MODERN PUBLICATION-MOLECULAR BASIS OF INHERITANCE -NCERT FILE (NCERT EXEMPLAR PROBLEMS) (Multiple Choice Questions)
  1. The first genetic material could be

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  2. With regard to mature mRNA in eukaryotes

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  3. The human chromosomes with the highest and least number of genes in th...

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  4. Who amongst the following scientists had no contribution in the develo...

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  5. DNA is a polymer of nucleotides which are linked to each other by 3'-5...

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  6. Discontinuous synthesis of DNA occurs in one strand, because

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  7. Which of the following steps in transcription is catalysed by RNA poly...

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  8. Control of gene experssion takes place at the level of

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  9. Regulatory proteins are the accessory proteins that interact with RNA ...

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  10. Which was the last human chromosome to be completely sequenced ?

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  11. Which of the following are the functions of RNA

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  12. While analysing the DNA of an organism a total number of 5386 nucleoti...

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  13. In some viruses, DNA is synthesised by using RNA as template, Such a D...

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  14. If Meselson and Stahl's experiment is continued for four generations i...

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  15. If the sequence of nitrogen bases of the coding strand of DNA in a tra...

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  16. The RNA polymerase holoenzyme transcribes

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  17. If the base sequence of a codon in mRNA is 5'-AUG-3', the sequence of ...

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  18. The amino acid attaches to the tRNA at its

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  19. To initiate translation, the mRNA first binds to

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  20. In E.coli, the lac operon gets switched on when :

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