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In negative operon...

In negative operon

A

co -repressor binds with repressor

B

co- repressor does not bind with repressor

C

co- repressor binds with inducer

D

cAMP has negative effect on lac operon

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The correct Answer is:
A
In negative operon co - repressor binds with repressor to from repressor co - repressor complex which further binds with operator . Since , the product of the regulator (the repressor) acts by shutting off the transcription of structural genes , it referred to as negative control system.
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A : Lac operon exerts negative control only. R: The operator is occupied by aporepressor during regulation.

Define an operon, giving an example, explain an inducible operon.

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Lac operon is

Lac Operon|Positive And Negative Regulation|Human Genome Project|Goals Of Human Genome Project

operon system | | Inducible operon | | Repressible system

Type OF gene | | Operon system | | Inducible operon

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.

What is an operon ? Explain the functioning of lac operon when in an open state.

NEET PREVIOUS YEAR (YEARWISE + CHAPTERWISE)-MOLECULAR BASIS OF INHERITANCE-EXERCISE
  1. In E.coli during lactose metabolism, repressor binds to :

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  2. Sequence of which of the following is used to know the phylogeny ?

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  3. In negative operon

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  4. In which direction mRNA is synthesises on DNA template ?

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  5. Gene and cistron words are sometimes used synonymously because

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  6. E. coli about to replicate was placed in a medium containing radioacti...

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  7. Due to discovery of which of the following in 1980 ' s the evolution w...

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  8. Who proposed the 'Signal hyothesis' meant for the biosynthesis of secr...

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  9. During replication of DNA , its two strands separate. Each of these se...

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  10. The Pneumococcus experiment proves that

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  11. In DNA when AGCT occurs , their association is as per which of the fol...

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  12. DNA parts which can switch their position are

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  13. Genes that are involved in turning on or off the transcription of set ...

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  14. Protein synthesis in an animal cell, takes place

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  15. Which of the following RNAs up specific amino acid (from amino acid po...

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  16. The three codons which result in the termination of polypeptide chain...

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  17. Genes are packed in bacterial chromosome by

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  18. An enzyme that joins the ends of two strands of nucleic acids is a

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  19. Okazaki fragments are seen during

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  20. Triplet for inhibitting process of translation is

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