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A "vector" in recombinant DNA technology serves to
A{'text': 'Carry alien DNA into the host cell', 'label': 'A'}
B{'text': 'Add methyl groups to DNA', 'label': 'B'}
C{'text': 'Prevent replication of DNA', 'label': 'C'}
D{'text': 'Excise all restriction sites', 'label': 'D'}
Answer & Solution
Correct answer: A. {'text': 'Carry alien DNA into the host cell', 'label': 'A'}
1. A vector in cloning transports an alien DNA fragment into a host organism.
2. NCERT draws an analogy with a mosquito acting as a biological vector.
3. Plasmids and bacteriophages are common cloning vectors.
4. A good vector has an ori, selectable marker and unique cloning sites for the insert.
_Source: NCERT Class 12 Biology, Ch 9 "Biotechnology: Principles and Processes", §9.1_
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