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Which of the following enzymes catalyse the removal of nucleotides from the ends of DNA?
1. endonuclease
2. exonuclease
3. DNA ligase
4. Hind - Il

Subtopic: Restriction Enzymes - Main Enzymes |

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‘Restriction’ in restriction enzyme refers to

1.	cleaving of phosphodiester bond in DNA by the enzyme
2.	cutting of DNA at specific position only
3.	prevention of the multiplication of bacteriophage by the host bacteria
4.	All of the above

Subtopic: Restriction Enzymes - Main Enzymes |

Level 3: 35%-60%

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Which of the following statements does not hold true for restriction enzymes?

1.	It recognises a palindromic nucleotide sequence
2.	It is an endonuclease
3.	It is isolated from viruses
4.	It produces the same kind of sticky ends in different DNA molecules

Subtopic: Restriction Enzymes - Main Enzymes |

83%

Level 1: 80%+

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