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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 genes and two structural genes

D

Three regulatory genes 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

MODERN PUBLICATION-MOLECULAR BASIS OF INHERITANCE -COMPETITION FILE OBJECTIVE TYPE QUESTIONS (Multiple Choice Questions (MCQs) :)
  1. Which is not found in RNA?

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  2. Hargovind Khorana is known for

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  3. The lac operon consists of

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  4. The unequivocal proof of DNA as the genetic material came from the stu...

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  5. Given below is a sample of a portion of DNA strand giving the base seq...

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  6. The double helical model of the DNA was proposed by Watson and Crick b...

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  7. The pyrimidine base which confers additional stability to DNA over RNA...

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  8. Methyl guanosine triphosphate is associated with :

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  9. Which one the following statements are correct ? (i) RNA polymerase ...

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  10. In Hershey and Chase experiments , radioactive .^(32)P was used to cul...

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  11. The inducer for switching 'on' the lac operon in bacteria is

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  12. Select the incorrect statement (s) : 1. Six codons do not code for ...

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  13. The haploid content of human DNA is

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  14. During transcription, DNA site at which RNA polymerase binds is called

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  15. In a double stranded DNA molecule , the percentage of cytosine is 18. ...

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  16. DNA contains nucleobases, sugar and phosphate. Removal of which among ...

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  17. The number of codons that code different amino acids is

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  18. Some amino acids are coded by more than one codon

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  19. Out of 64 codons, the number of codons with GGGis

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  20. The genetic material of a virioid is :

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