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In E.coli, lac operon is induced by...

In E.coli, lac operon is induced by

A

'I'' gene

B

Promoter gene

C

`beta` - galactosides

D

Lactose

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The correct Answer is:
A
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In E. coli, the lac operon gets switched on when

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Give a labelled schematic representation of "lac operon" in its "Switched off" position.

Iac operon in E.coil

Which of following statement is true for lac operon in E-coli (a) lac operon consists of one regulatory gene and five structural gene. (b) The i gene codes for inducer (c) The z-gene codes for beta -galacosidase (d) A very low level of expression of lac operon has to be present in cell all the time

Assertion :- Lac opertor is present only in lac operon & it interact specifically with lac repressor only. Reason : Each operon has its specific operator & specific repressor.

(a) State the arrangement of different genes that in bacteria is referred to as operon. (b) Describe the role of lactose in lac operon. (c) Draw a schematic labelled illustration of lac operon in a switched on state.

Why does the lac operon shut down some time after the addition of lactose in the medium where E.coli was growing ? Why low level expression of lac operon is always required ?

AAKASH INSTITUTE ENGLISH-MOLECULAR BASIS OF INHERITANCE -ASSIGNMENT (SECTION -C) Previous Years Questions
  1. The 1992 Noble Prize for medicine was awarded to Edmond H. Fischer ...

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  2. Initiation codon in eukaryotes

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  3. In E.coli, lac operon is induced by

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  4. Protein helping in opening of DNA double helix in front of replication...

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  5. In protein synthesis the polymerization of amino acids involves three ...

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  6. Anticodon is an unpaired triplet of bases in an exposed position of

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  7. An environmental agent that triggers transcription from an operon is a...

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  8. In slpit genes, the coding sequences are called

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  9. Lac operon is

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  10. If the DNA condons are ATG ATG ATG and a cytosine base is inserted at...

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  11. The wild type E. coli cells are growing in normal medium with glucose....

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  12. If the sequences of bases in DNA is ATTCGATG, then the sequence of bas...

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  13. Which of the following serves as an stop codon ?

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  14. The codons causing chain termination (stop codons) are

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  15. DNA synthesis can be specifically measured by estimating the incorpora...

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  16. Which step of translation does not consume high energy PO(4) bond?

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  17. DNA parts can switch their positions are

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  18. Sequence of which of the following is used to know the phylogeny : -

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  19. Genes that are involved in turning on or off the transcription of a se...

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  20. In operon concept, regulator gene functions as:

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