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In E. coli, tryptophan switches off the ...

In E. coli, tryptophan switches off the trp operon by

A

inactivating the repressor

B

inactivating the gene for the first enzyme in the pathway by feedback inhibition

C

binding to the repressor and increasing the latters affinity for the operator

D

binding to the operator

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The correct Answer is:
C
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E coli. is:

Study the schematic representation of the genes involved in the lac operon given below and answer the questions that follow : {:(p,i,p,o,z,y,a):} (a) Identify and name the regulatory gene in this operon. Explain its role in 'switching off' the operon. (b) Why is the lac operon's regulation referred to as negative regulation ? (c ) Name the inducer molecule and the products of the genes 'z' and 'y' of the operon. Write the functions of these gene products.

In E.coli replication starts at :

In E. coli, the lac operon gets switched on when

Tryptophan operon is

In tryptophan operon

In E.coli, the lac operon gets switched on when :

ARIHANT NEET-GENE, ITS EXPRESSION AND REGULATION-Chapter Exercise (A) Taking it together (Assorted questions of the Chapter for Advanced Level Practice
  1. When TMV-RNA is used for infection, the amino acid sequence of the coa...

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  2. Which of the following is not true for an anticodon?

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  3. In E. coli, tryptophan switches off the trp operon by

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  4. A bacterium with completely radioactive DNA was allowed to replicate i...

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  5. RNA and DNA were artificially synthesised in vitro by

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  6. There are 64 codons in genetic code dictionary because

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  7. A songle anticodon can recognize more than one codon of m-RNA. This ph...

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  8. What becomes established from the wooble hypothesis

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  9. In order to enable a chemical to serve as a genetic material , it is e...

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  10. In the absence of beta- galactosides, transcription of

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  11. The complex CAP-c-AMP, which increases the affinity of RNA polymerase ...

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

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

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  14. Which of the following statements is correct?

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

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  16. RNA polymerase

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

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  18. Genetic material is

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  19. Transfer RNA

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  20. Translocation involves

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