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The wild type E. coli cells are growing ...

The wild type E. coli cells are growing in normal medium with glucose. They are transferred to a medium containing only lactose as sugar. Which of the following changes take place ?

A

The lac operon is repressed

B

All operons are induced

C

The lac operon is induced

D

E. coli cells stop dividing

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The correct Answer is:
C
Inducible genes are the genes which remain inactive or repressed in a cell and can be activated when a certain substrate is to be metabolised . It has been seen when lactose is added to the medium of E. coli the poeron is induced and synthesis of enzymes required for degradation of lactose to glucose and galactose starts.
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NEET PREVIOUS YEAR (YEARWISE + CHAPTERWISE)-MOLECULAR BASIS OF INHERITANCE-EXERCISE
  1. If the sequences of bases in DNA is ATTCGATG, then the sequence of bas...

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

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

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  4. Which is not directly involved in protein synthesis ?

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  5. There are special proteins that help to open up DNA double helix in fr...

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  6. DNA template sequence of CTGATAGC is transcribed over mRNA as

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  7. In Escherichia coli, lac operon is induced by :

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  8. Reverse transcriptase is :

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  9. The number of base substitution possible in amino acid codons is

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  10. The codon for the initiation of protein synthesis in eukaryotes is :

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  11. Nucleosome core is made of :

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  12. A DNA with unequal nitrogen bases would most probably be

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  13. The process of translation is :

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  14. Durning DNA replication, the strands separate by

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  15. Who proved that DNA is the basic genetic material ?

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  16. some amino acids are coded by more than one codon, hence the genetic c...

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  17. Nucleotide arrangement in DNA can be seen by

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  18. The transforming principle of Griffith's experiment was DNA. A very, M...

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  19. Experimental material in the study of DNA replication has been

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  20. Khorana first deciphered the triplet codons of

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