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A short sequence of DNA where the repre...

A short sequence of DNA where the repressor binds, preventing RNA polymerase from attaching to the promoter is called :

A

regulator

B

operator

C

promoter

D

none of these

Text Solution

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The correct Answer is:
B
When the repressor is bound to the operator, it prevents the RNA polymerase from initiating transcription of the operator.
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The lac operon consists of a regulation gene and three structural gene. The lactose acts as inducer. In the presence of an Inducer such as lactose, the repressor is in inactivated during the interaction. This allows RNA polymerase access to the promoter and transcription proceeds. The repressor is synthesized which in turn binds with the operator region of the operon and prevents RNA polymerase from transcribing the operon. What provides binding site to RNA polymerase?

The region of DNA sequence that provides binding site for RNA polymerase is :

The lac operon consists of a regulation gene and three structural gene. The lactose acts as inducer. In the presence of an Inducer such as lactose, the repressor is in inactivated during the interaction. This allows RNA polymerase access to the promoter and transcription proceeds. The repressor is synthesized which in turn binds with the operator region of the operon and prevents RNA polymerase from transcribing the operon. Identify the correct sequence of the structural genes in the lac operon.

The lac operon consists of a regulation gene and three structural gene. The lactose acts as inducer. In the presence of an Inducer such as lactose, the repressor is in inactivated during the interaction. This allows RNA polymerase access to the promoter and transcription proceeds. The repressor is synthesized which in turn binds with the operator region of the operon and prevents RNA polymerase from transcribing the operon. The lac operon of E. coli contains genes involved in lactose metabolism. It's expressed only when lactose is _____ (1)and glucose is _____(2).

The lac operon consists of a regulation gene and three structural gene. The lactose acts as inducer. In the presence of an Inducer such as lactose, the repressor is in inactivated during the interaction. This allows RNA polymerase access to the promoter and transcription proceeds. The repressor is synthesized which in turn binds with the operator region of the operon and prevents RNA polymerase from transcribing the operon. Which of the following statement is true in reference to the lac operon process in E.coli? (i) Galactosidase is the only enzyme produced in large quantities when lac operon is turned on (ii) The messenger RNA in lac operon is a polycistronic mRNA

DNA polymerase can be obtained from

DNA polymerase is isolated from bacteria

DNA polymerase lambda promotes :

Operator gene is the site or gene for binding RNA polymerase in an Operon.

GRB PUBLICATION-GENE EXPRESSION AND REGULATION-NCERT Corner(Exemplar Problems)
  1. A short sequence of DNA where the repressor binds, preventing RNA pol...

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  2. In a DNA strand the nucleotides are linked together by

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  3. A nucleoside differs from a nucleotide. It lacks the

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  4. Both deoxyribose and ribose belong to a class of sugars called

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  5. the fact that a purine base always pairs through hydrogen bonds with a...

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  6. The net electric charge on DNA and histones is

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  7. The promoter site and the terminator site for transciption are located...

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  8. Which of the following statements is the most appropriate for sickle c...

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  9. One of the following is true with respect to AUG

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  10. The first genetic material could be

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  11. With regard to mature mRNA in eukaryotes

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  12. The human chromosome with the highest and least number of gens in the...

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  13. Who amongst the following scientists had no contribution in the deve...

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

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

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

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

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

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

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  20. Which of the following are the functions of RNA

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

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