alleryRecombinant DNA (rDNA) is best defined as:
AA single-stranded length of bacterial DNA
BA combination of vector DNA and a desired DNA fragment
CThe repetitive satellite portion of human DNA
DA naturally occurring circular plasmid alone
Answer & Solution
Correct answer: B. A combination of vector DNA and a desired DNA fragment
1. rDNA is created when DNA from two different sources is joined.
2. In gene cloning the desired DNA fragment is inserted into a vector such as a plasmid to make rDNA.
3. So rDNA is the combination of vector DNA and the desired fragment, not the plasmid alone, making D a trap.
4. Hence the answer is B.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit "Breeding and Biotechnology", p.299_
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