Answer: Cut DNA at specific sequences.
- A Join separate DNA fragments back together
- B Cut DNA at specific sequences
- C Copy DNA strands during replication
- D Translate mRNA into a protein chain
Correct answer: B. Cut DNA at specific sequences
Explanation: Restriction enzymes (endonucleases) cut DNA at specific recognition sequences. They are molecular scissors for genetic engineering.
Recombinant DNA technology: a gene of interest and plasmid are cut by the same restriction enzyme, ligated into a recombinant plasmid, and introduced into a host cell.
Concept context
Recombinant DNA, GMOs, PCR, CRISPR, and biotechnology applications. Growing importance in NEET.
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