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In the lac operon, the structural genes ...

In the lac operon, the structural genes are switched off when

A

repressor binds to the operator

B

repressor binds to the promotor

C

repressor binds to the regulator

D

repressor binds to the inducer

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The correct Answer is:
A
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NEW JOYTHI PUBLICATION-MOLECULAR BASIS OF INHERITANCE-PREVIOUS YEAR COMPETITIVE EXAM QUESTIONS
  1. Which one of the following is correctly matched?

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  2. Okazaki fragments are joined in a correct sequence by

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  3. In the lac operon, the structural genes are switched off when

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  4. The process of reverse transcription' was brought to light by the work...

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  5. The technique of DNA fingerprinting was pioneered and perfected by

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  6. Statements i. The four nucleotide bases are not necessarily prese...

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  7. Which of the following group of codons code for amino acid serine?

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  8. Choose the wrong statement in the process of protein synthesis.

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  9. In regulation of gene expression in prokaryotes I. Lactose acts ...

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  10. Which of the following is not relevant to the structure of double heli...

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  11. The length of the haploid content of human DNA is

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  12. Meselson and Stahl experiment proved

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  13. The basis of DNA fingerprinting is

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  14. Select the correct bases of DNA, RNA and amino acid of beta chain resu...

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  15. When a segment of a chromosome breaks and later rejoins after 180^@ r...

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  16. What would be the correct base sequence in mRNA for the given DNA stra...

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  17. In DNA of certain organisms, guanine constitutes 20% of the bases. Wha...

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  18. The process of transformation was discovered by

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  19. Which of the following codons has no tRNA?

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  20. Which one of the following nitrogenous base is seen only in RNA?

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