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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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ARIHANT NEET-GENE, ITS EXPRESSION AND REGULATION-Chapter Exercise (A) Taking it together (Assorted questions of the Chapter for Advanced Level Practice
  1. The replication of DNA in eukaryotes commences from

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

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

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  4. Which of the following are the functions of RNA

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  5. The RNA polymerase holoenzyme transcribes

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

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  7. With regard to mature mRNA in eukaryotes

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  8. When TMV-RNA is used for infection, the amino acid sequence of the coa...

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  9. Which of the following is not true for an anticodon?

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  10. In E. coli, tryptophan switches off the trp operon by

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  11. A bacterium with completely radioactive DNA was allowed to replicate i...

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  12. RNA and DNA were artificially synthesised in vitro by

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  13. There are 64 codons in genetic code dictionary because

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  14. A songle anticodon can recognize more than one codon of m-RNA. This ph...

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  15. What becomes established from the wooble hypothesis

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  16. In order to enable a chemical to serve as a genetic material , it is e...

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  17. In the absence of beta- galactosides, transcription of

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  18. The complex CAP-c-AMP, which increases the affinity of RNA polymerase ...

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  19. If following is the sequence of nucleotides in mRNA , predict the sequ...

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  20. In a transcription unit, the activity of RNA polymerase at a given pro...

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