- A Randomly mutating existing DNA using chemical mutagens
- B Cutting DNA with restriction enzymes and joining foreign DNA with ligase
- C Copying DNA exclusively through repeated PCR amplification cycles
- D Physically excising genes from chromosomes without replacement
Correct answer: B. Cutting DNA with restriction enzymes and joining foreign DNA with ligase
Explanation: Recombinant DNA: restriction enzymes cut host and foreign DNA; ligase joins them. The resulting hybrid DNA molecule is recombinant DNA.
Concept context
Recombinant DNA, GMOs, PCR, CRISPR, and biotechnology applications. Growing importance in NEET.
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