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The lac operon requires a ' helper' prot...

The lac operon requires a ' helper' protein which, by binding to the promoter and by facilitating the attachment ofRNA polymerase , accelerates the rate of transcription . The proteinis

A

amino acid activating enzyme

B

essential metabolite

C

inactive repressor protein

D

catabolite activator

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The correct Answer is:
D
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In Lac-operon, repressor protein binds to

Read the statements regarding the lac operon and choose the correct option. 1. An inducer regulates the switching on and off of lac operon. 2. Repressor protein dissociates from operator region and prevents RNA polymerase from transcribing the operon. 3. In the presence of lactose, the repressor is activated by interaction with lactose. 4. RNA polymerase has access to the promoter and transcription proceeds only when the repressor is inactivated.

In lac operon RNA polymerase binds with

To which of the following factors, RNA polymerase binds transiently to initiate transcription

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

A specific nucleotide sequence to which RNA polymerase attaches to initiate transcription of mRNA from a gene

RNA polymerase binds to promoter and initiates transcription (Initiation). It uses

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. 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. What provides binding site to RNA polymerase?

ARIHANT NEET-GENE, ITS EXPRESSION AND REGULATION-Chapter Exercise (A) Taking it together (Assorted questions of the Chapter for Advanced Level Practice
  1. The wild type E. coli cells are growing in normal medium with glucose....

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  2. In an E coli cell according to the operon theory, an operator gene com...

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  3. The lac operon requires a ' helper' protein which, by binding to the p...

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  4. Which one of the following pairs is correctly matched?

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  5. During protein synthesis , the correct amino acid is brought to the ri...

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  6. Addition of lactose in a culture of E. coli induces enzymes ----------...

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  7. Practice using the dictionary of the genetic code determine the amino ...

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  8. During protein synthesis , the correct amino acid is brought to the ri...

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  9. Which among the following codon do not codes for valine (val)?

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  10. The process of translation requires

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  11. Which of the following is true about the terminator

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  12. Which of the following is true about the promoter gene?

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  13. In protein synthesis, a polypeptide of five amino acids is synthesized...

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  14. In mRNA , AUG is the initiating codons and UAA, UAG and UGA are termin...

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  15. In tryptophan synthesis pathway , tryptophan acts as a compressor . Wh...

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

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  17. Which of the following is true for RNA processing?

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  18. A DNA molecule in which both strands have radioactive thymidine is all...

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  19. A bacteria containing 100% N^(15) nitrogen bases is allowed to replica...

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  20. A DNA molecule in E. coli is heavy and labelled with N^(15). Iit is al...

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