What does 'cloning DNA' mean?

• A. Cutting DNA into segments
• B. Making copies of DNA segments
• C. Separating DNA fragments
• D. Recombining DNA fragments

Answer: (B)

Cloning DNA means creating multiple identical copies of a DNA sequence. The goal is to have enough material to study, manipulate, or express the gene. In practice, this often involves inserting the DNA fragment into a cloning vector and letting host cells replicate it, producing many copies or clones of the sequence. This is different from simply cutting DNA into segments, separating fragments, or recombining fragments, which describe other steps or processes in DNA work.