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In a bacterial cell, the small circular double-stranded DNA molecule that lies separate from the chromosomal DNA and can replicate independently is the:
ATransgene
BSatellite DNA
CPlasmid
DLigase
Answer & Solution
Correct answer: C. Plasmid
1. The text describes a small circular double-stranded DNA in the bacterial cytoplasm, separate from chromosomal DNA, that replicates on its own.
2. This is the plasmid, used as a vector in gene cloning.
3. A transgene is an inserted gene, satellite DNA is repetitive human DNA, and ligase is an enzyme, so A, B and D are wrong.
4. Hence the answer is C.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit "Breeding and Biotechnology", p.299_
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