Topic: Tools: restriction enzymes, vectors, host· Biotechnology and Its Applications

Choose the correct pair from the following :

1. Ligases - Join the two DNA molecules

2. Polymerases - Break the DNA into fragments

3. Nucleases - Separate the two strands of DNA

4. Exonucleases - Make cuts at specific positions within DNA

Doubtly Asked 30 Oct 2026 NEET UG 2020 Practice test neet Save WhatsApp Report

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Answer: 1. Ligases - Join the two DNA molecules

Key idea: Ligases join DNA fragments.

DNA ligase seals the sugar-phosphate backbone between two DNA molecules. Polymerases synthesise DNA, nucleases cut DNA, and restriction endonucleases (not exonucleases) cut at specific internal sites. Exonucleases remove nucleotides from the ends. Hence option 1 is the only correct pair.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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Choose the correct pair from the following :

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