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Question

Internal phosphodiester bond in a nucleic acid molecule is hydrolysed by _______________.


A
Exonuclease
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B
Endonuclease
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C
DNA polymerase
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D
Deoxyribonucleic acid
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Solution

The correct option is B Endonuclease
  • In DNA and RNA, the phosphodiester bond connects a 3'-carbon to a 5'-carbon which is hydrolyzed by the endonuclease restriction enzyme. 
  • Endonuclease makes cuts within the DNA strands while exonuclease removes nucleotides from the end part of the DNA. 
  • DNA polymerase enzymes synthesize DNA molecules from deoxyribonucleotides.

Hence, the correct answer is option B, i.e., Endonuclease.

Biology

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