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E. coli cell with a mutated Z gene of th...

E. coli cell with a mutated Z gene of the lac operon cannot grow in medium containing only lactose as the source of energy because:

A

In the presence of glucose, E. coli cells do not utilise lactose

B

They cannot transport lactose from the medium into the cell

C

The lac operon is constitutively active in these cells

D

They cannot synthesis functional `Beta`-galactosidase

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The correct Answer is:
D
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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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