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Which of the following pairs is correctly matched? a) DNA Polymerse - Molecular Scissors b) Ligases - Molecular Scissors c) Ligases - Molecular Scissors d) Restriction Endoonucleases - Molecular Scissors

Which of the following pairs is correctly matched? a) DNA Polymerse - Molecular Scissors b) Ligases - Molecular Scissors c) Ligases - Molecular Scissors d) Restriction Endoonucleases - Molecular Scissors Correct Answer d

  • Restriction Endonuclease enzyme is known as the molecular scissor because a restriction enzyme recognizes and cuts the DNA only at a particular sequence of nucleotides and producing smaller fragments. 
  •  DNA ligase (polydeoxyribonucleotide synthase) is the enzyme that joins two single-stranded DNA fragments by catalyzing the formation of an inter-nucleotide ester bond between phosphate and Deoxyribose. It is active during DNA replication, DNA repair and DNA recombination.
  • The DNA polymerases are enzymes that create DNA molecules by assembling nucleotides, the building blocks of DNA. 

Related Questions

Two statements are given, followed by two conclusions numbered I and II. Assuming the statements to be true, even if they seem to be at variance with commonly known facts, decide which of the conclusions logically follow(s) from the statements. Statements: All papers are scissors. Some scissors are stones. Conclusions: I. All scissors are papers. II. Some stones are scissors.
Assertion (A): Scientists can cut apart and paste together DNA molecules at will, regardless of the source of the molecules.
Reason (R): DNA fragments can be manipulated using restriction endonucleases and DNA ligases.
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1. The very first requirement of DNA synthesis is the presence of a template or plan along which the new strand is to be constructed
2. The second requirement is of a DNA-dependent-DNA polymerase or simply DNA polymerase enzyme
3. A DNA Pol cannot join two free nucleotides; one of them must be anchored by hydrogen bonds to a DNA strand
4. Replication takes place bidirectionally
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