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Restriction endonucleases are...

Restriction endonucleases are

A

used for in vitro DNA synthesis

B

synthesized by bacteria as part of their defense mechanism

C

present in mammalian cells for degradation of DNA when the cells dies

D

used in genetic engineering for ligasting two DNA molecules

Text Solution

Verified by Experts

The correct Answer is:
b
Restriction endnucleases are synthesised by bacteria as part of their defence mechanism. It is an enzyme that cuts DNA at or near specific recognition nucleotide sequences known as restriction sites. These enzymes are found in bacteria to provide a defence mechanism against viruses by cleaning the toxic viral DNA
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ARIHANT NEET-BIOTECHNOLOGY : PRINCIPLES AND PROCESSES-Chapter exercises (C. Medical entrances gallery (Collection of Questions Asked in NEET & Various Medical Entrance Exams))
  1. DNA polymerase is isolated from bacteria

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  2. Bacteria protect themselves from viruses by fragmenting viral DNA upon...

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  3. Restriction endonucleases are

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  4. Assertion : Gel electrophoresis and elution are two important processe...

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  5. The function of a selectable marker is

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  6. Which vector can clone only a small fragment of DNA ?

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  7. In insertional inactivation of beta-galactosidase gene, the bacteria i...

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  8. Identify the steps that are involved in PCR I. Denaturation II. ...

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  9. The recognition sequences of restriction enzyme 'A' is GGCC and that ...

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  10. The cloning vectors M13 has genetic material

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  11. Which of the following enzyme is used to join DNA fragments :

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  12. Restriction endonucleases are enzymes that

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  13. The introduction of T-DNA into plants involves

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  14. The DNA molecules of which the gene of interset is integrated for clon...

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  15. The cutting of DNA at specific locations became possible with the disc...

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  16. An analysis of chromosomal DNA using the southern hybridization techni...

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  17. Commonly used vectors for human genome sequencing are

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  18. The first recombinant DNA was constructed by linking an antibiotic re...

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  19. The Polymerase Chain Reaction (PCR) is technique that is used for

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  20. Bioreactors are useful in

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