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In a transcription unit, the activity of...

In a transcription unit, the activity of RNA polymerase at a given promoter is in turn regulated by interaction with accessory proteins, which affect its ability to

A

recognise start sites

B

bind to initiator

C

terminate the polypeptide chain

D

release the polypeptide chain

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The correct Answer is:
A
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Assertion :- The activity of RNA polymerase at a pormotor is regulated by interaction with accessory protein, which affect its ability to recognise start sites. Reason : The accessibility of promotor ragion of prokaryotic DNA is in many cases is regulated by interactin of proteins with operators.

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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.

ARIHANT NEET-GENE, ITS EXPRESSION AND REGULATION-Chapter Exercise (A) Taking it together (Assorted questions of the Chapter for Advanced Level Practice
  1. The complex CAP-c-AMP, which increases the affinity of RNA polymerase ...

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

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

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  4. Which of the following statements is correct?

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  5. The gene, which producers mRNA has specific start and stop signals, wh...

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  6. RNA polymerase

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  7. UAA, UAG and UGA are known as non - sense codons because they

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  8. Genetic material is

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  9. Transfer RNA

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  10. Translocation involves

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  11. Changes in a polypeptide after translation may involve the

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  12. Several proteins may be produced at the same time

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  13. A ribozyme is an

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  14. Inducible enzyme are

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  15. The control of gene expression is more complex in eukaryotic cells bec...

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  16. What are proteosomes

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

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  18. The first undoubted evidence about DNA being the genetic material came...

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  19. Dr. Khorana and his colleagues synthesized an RNA molecule with repeat...

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  20. The promoter site and the terminator site for transcription are locate...

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