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Gene regulation governing lactose operon...

Gene regulation governing lactose operon of E. coli that involves the lac I gene product is

A

Negative and inducible because repressor protein prevents transcription

B

Negative and repressible because repressor protein prevents transcription

C

Feedback inhibition because excess of `beta` - galactosidase can switch off trascription

D

Positive and inducible because it can be induced by lactose

Text Solution

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The correct Answer is:
B
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The sequence of genes in lac operon in E. coli is :

What is true of E. coli with lac -z gene ?

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

The promoter gene in lac operon :

(a) Explain with the help of schematic representation the lac operon of E. coli. (b) Mention the role of lactose in this operon.

Enlist the genes in Lac operon

Given above is the schematic representation of lac operon of E.coli. Explain the functioning of this operon when lactose is provided in the growth medium of the bacteria.

MOTION-MOLECULAR BASIS OF INHERITANCE-EXERCISE - 3
  1. Commonly used vectors for human genome sequencing are

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  2. In sea urchin DNA, which is double stranded, 17% of the bases were sho...

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  3. Gene regulation governing lactose operon of E. coli that involves the ...

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  4. which one of the following is not applicable to RNA

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  5. Satellite DNA is important because it

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  6. Which of the following is required as inducer(s) for the expression of...

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  7. The final proof for DNA as the genetic material came from the experime...

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  8. If there are 999 bases in RNA that codes for a protein with 333 amino ...

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  9. During DNA replication, Okazaki fragments are used to elongate :

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  10. Which of the following RNAs should be most abundant in animal cell

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  11. DNA replication in bacteria occurs

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  12. Spliceosomes are not found in cell of

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  13. The association of histone H1 with a nucleosome indicates

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  14. Select the correct statement:

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  15. The experimental proof for semiconservative replication of DNA was fir...

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  16. All of the following are parts of an operon except

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  17. AGGTATCGCAT is a sequence from the coding strand of a gene. What will ...

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  18. Expressed Sequence Tags (ESfs) refers to :

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  19. Under which of the following conditions there will be no change in the...

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  20. Purines found both in DNA and RNA are

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