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Lactose (Lac) operon is regulated by :...

Lactose (Lac) operon is regulated by :

A

Lac repressor only

B

Lac repressor and CAP-cGMP complex

C

Lac repressor and CAP-cAMP complex

D

CAP-cAMP and CAP-c-GMP complex

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The correct Answer is:
C
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Lac operon is related with :

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A polycistronic structural gene of lac operon is regulated by

In Escherichia coli, lac operon is induced by :

The lac operon is an example of :

In lac-operon , which protein is not regulated by the repressor?

(a) Absence of lactose in the culture medium affects the expression of a lac-operon in E.coli. Why and how ? Explain. (b) Write any two ways in which the gene expression is regulated in eukaryotes.

Assertion :- In lac operon, a polycistronic structural gene is regulated by a common promoter & regulatory genes. Reason : Such arrangement is very common in bacteria & is referred as operon.

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GRB PUBLICATION-GENE EXPRESSION AND REGULATION-NCERT Corner(Exemplar Problems)
  1. Lactose (Lac) operon is regulated by :

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  2. In a DNA strand the nucleotides are linked together by

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  3. A nucleoside differs from a nucleotide. It lacks the

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  4. Both deoxyribose and ribose belong to a class of sugars called

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  5. the fact that a purine base always pairs through hydrogen bonds with a...

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  6. The net electric charge on DNA and histones is

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  7. The promoter site and the terminator site for transciption are located...

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  8. Which of the following statements is the most appropriate for sickle c...

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  9. One of the following is true with respect to AUG

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  10. The first genetic material could be

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  11. With regard to mature mRNA in eukaryotes

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  12. The human chromosome with the highest and least number of gens in the...

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  13. Who amongst the following scientists had no contribution in the deve...

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  14. DNA is a polymer of nucleotides which are linked to each other by 3'-5...

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  15. Discontinuous synthesis of DNA occurs in one strand, because

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  16. Which of the following steps in transcription is catalysed by RNA poly...

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  17. Control of gene experssion takes place at the level of

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  18. Regulatory proteins are the accessory proteins that interact with RNA ...

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  19. Which was the last human chromosome to be completely sequenced ?

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  20. Which of the following are the functions of RNA

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  21. While analysing the DNA of an organism a total number of 5386 nucleoti...

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