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E. colicells with a mutated z gene of th...

E. colicells with a mutated z gene of the lac operon cannot grow in medium containing only lactose as the source of energy because

A

They cannot synthesize functional betagalactosidase

B

They cannot transport lactose from the medium into the cell

C

The lac operon is constitutively active in these cells

D

ln the presence of glucose, E. coli cells do not utilize lactose

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A
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MOTION-MOLECULAR BASIS OF INHERITANCE-EXERCISE - 2
  1. Consider the folowing sequence on m-RNA AUGGCAGUGCCA. Assuing that gen...

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  2. A normal DNA molecule is continuously replicate in N^(15) medium than ...

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  3. KHORANA synthesized two RNAs (a) with repeat sequence of AB and (b) w...

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  4. Which of the following m-RNA is translated completely :- (A) 5' AUG ...

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  5. In a m-RNA sequence of N(2) -bases in 5' AUG GUG CUC AAA'3. What the c...

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  6. Suppose evolution on earth has occurred in such a way that there are 9...

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  7. Assume that there are 6 types of nitrogen bases available and 40 types...

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  8. In a 3.2 Kbp long piece of DNA , 820 adenine bases were found. What ...

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  9. Which statement is correct ? (a) Degeneracy of code is related to, t...

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  10. Both the strand of DNA are not copied during transcription because :-

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  11. The salient feature of DNA are - (i) It is made of two polynucleotid...

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  12. Which is incorrect for genetic code - (i) The codon is triplet (i...

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  13. Which is correct - (i) t-RNA has an anticodon loop that has bases co...

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  14. E. colicells with a mutated z gene of the lac operon cannot grow in me...

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  15. DNA fingerprinting refers to

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  16. Select the incorrect statement.

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  17. Regulation of lac operon by repressor is referred to as -

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  18. Which is incorrect

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  19. The sequence of structural genes in lac operon is

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  20. In density gradient centrifugation, the bulk DNA forms while satelite ...

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