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The sequence of structural genes in lac...

The sequence of structural genes in lac operon is

A

Lac A, Lac Y, Lac Z

B

Lac A, Lac Z, Lac Y

C

Lac Y, Lac Z, Lac A

D

Lac Z, Lac Y, LacA

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The correct Answer is:
D
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Sequence of structural genes of lac operon is

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. Identify the correct sequence of the structural genes in the lac operon.

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The promoter gene in lac operon :

Enlist the genes in Lac operon

A polycistronic structural gene of lac operon is regulated by

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How are the structural genes activated in the lac operon in E. coli ?

(a) Explain the role of regulatory gene, operator and structural genes in lac operon when E. Coli is growing in a culture medium with the sources of energy as lactose.

ARIHANT NEET-GENE, ITS EXPRESSION AND REGULATION-Chapter Exercise (C) Medical entrance s gallery
  1. According to the lac operon concept, which functional unit of the bact...

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  2. The phenomenon of 5' end third base of tRNA pairing. With non-compleme...

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  3. Jacob and Monod studied lactose metabolism in E. coli and proposed ope...

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  4. Which of the following group of codons code for amino acid serine ?

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  5. During transcription holoenzyme RNA polymerase binds to a DNA sequence...

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  6. The Okazaki fragments in DNA chain growth

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  7. A sequential expression of a set of human genes occurs when a steroid ...

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  8. Anticodon is present on

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  9. During translation initiation in prokaryotes, a GTP molecule is needed...

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  10. Consider the following statements : Assertion (A) : Amber codon is a...

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  11. In regulation of gene expression in prokaryotes : A. Lactose acts as...

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  12. Formation of mRNA for DNA is

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  13. Central dogma of genetic information is modified by the discovery of :

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  14. The concept of 'operon' was proposed by :

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  15. Which conserved motifs are found in E. coli genes ?

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  16. Eukaryotic RNA polymerase-III catalyses the synthesis of

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  17. The sequence of structural genes in lac operon is

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  18. Choose the wrong statement in the process of protein synthesis

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  19. During transcription holoenzyme RNA polymerase binds to a DNA sequence...

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  20. E. coli cell with a mutated Z gene of the lac operon cannot grow in me...

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