- A Cut DNA at specific recognition sites
- B Join DNA fragments together
- C Amplify DNA exponentially through repeated cycles
- D Determine the nucleotide sequence of DNA
Correct answer: B. Join DNA fragments together
Explanation: DNA ligase seals (joins) the nicks between DNA fragments, creating a continuous strand. Called molecular glue.
Concept context
Recombinant DNA, GMOs, PCR, CRISPR, and biotechnology applications. Growing importance in NEET.
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