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NEET BIOLOGYMolecular Basis of InheritanceEasy

Question

Choose the correct pair from the following :

A

Polymerases - Break the DNA into fragments

B

Nucleases - Separate the two strands of DNA

C

Exonucleases - Make cuts at specific positions within DNA

D

Ligases - Join the two DNA molecules

Step-by-Step Solution

  • Ligases are enzymes that join DNA fragments together (e.g., joining an antibiotic resistance gene with a plasmid vector) , .
  • Polymerases extend primers using nucleotides to synthesize/polymerise DNA, they do not break it .
  • Nucleases are enzymes that degrade DNA; specifically, Exonucleases remove nucleotides from the ends of the DNA, whereas Endonucleases make cuts at specific positions within the DNA .
  • Separation of DNA strands is typically achieved by denaturation (heat) or enzymes like helicases, not nucleases. Therefore, only the pair describing Ligases is correct.

Exam Context & Concepts Covered

This question aligns with the NEET BIOLOGY syllabus, specifically targeting concepts from Molecular Basis of Inheritance. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

BIOLOGYMolecular Basis of Inheritancechoosecorrectfollowing

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