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Which one of the following statements re...

Which one of the following statements regarding lac operon is correct?

A

Lac operon is inducible system

B

Lac operon is repressible system

C

Lac operon of E.coli contain four structural genes

D

None of the above

Text Solution

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The correct Answer is:
A
Lac operon is an inducible operon in which the presence of key metabolic substance i.e lactose indices transcription of structural genes lac person consist of three structural genes Tryptophan operon is a repressible operon where repressor is inactive and it becomes active as DNA binding proteins complexed with corepressor
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ARIHANT NEET-GENE, ITS EXPRESSION AND REGULATION-Chapter Exercise (C) Medical entrance s gallery
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  2. which of the following amino acid codon was used by khorana?

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  3. Which one of the following statements regarding lac operon is correct?

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  4. Select the true statement

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  5. If one strand of DNA has the nitrogenous base sequence as ATCTG, what ...

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  6. Antibiotic inhibiting interaction between tRNA and mRNA during protein...

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  7. Out of 64 codons, the number of codons with GGGis

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  8. Removal of RNA polymerase III from nucleoplasm will affect the synthes...

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  9. DNA has equal number of adenine and thymine residuces (A=T) and equal ...

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  10. Given below is a sample of a portion of DNA strand giving the base seq...

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  11. Peptide synthesis inside a cell takes place in

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  12. The scientist who was awarded Nobel prize in 1959 for in vitro synthes...

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  13. cDNA is formed by

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  14. The central dogma of protein synthesis is :

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  15. Gene of bacteria and virus code for more than one polypeptide are call...

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  16. Methl guanosine triphosphate is associated with

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  17. Which one the following statements are correct ? (i) RNA polymerase ...

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  18. The one aspect which is not a salient feature of genetic code, is its...

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  19. Select the two correct statements out of the four (1-4) given below ab...

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  20. The process of removal of introns and joining of exons is called :

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