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The lac operon consists of :...

The lac operon consists of :

A

four regulatory genes only

B

one regulatory gene and three structural genes

C

two regulatory gene and two structural genes

D

three regulatory gene and three structural genes

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The correct Answer is:
D
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Assertion (A): Lactose is the substrate for the enzyme beta-galactosidase and it regulates switching on and off of the lac operon. Reason ( R): The lac operon consists of one regulatory gene and three structural genes.

Here are some correct and some wrong statements. Correct only those statements which are wrong: (a) The genetic code is universal. (b) The genetic code is ambiguous. (c) The genetic code is regenerate. (d) Transfer RNA (tRNA) carry amino acids to mRNA codons and used again and again in transcription. (e) UAA, UAG and UGA are terminator codon. (f) Lac operon consists of regulatory genes, operator gene, structural and promoter gene.

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The lac operon is turned on when allolactose molecules bind to

The lac operon is an example of :

In the following diagram of the lac operon, which is an operon for inducible enzymes , identify the components and enzymes.

In lac operon, lactose acts are

GRB PUBLICATION-GENE EXPRESSION AND REGULATION-NCERT Corner(Exemplar Problems)
  1. The lac operon consists of :

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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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