NEET 2026
- Exam
- NEET
- Year
- 2026
- Subject
- Biology
- Chapter
- Chapter
NEET 2026 · Biology · Chapter
A genetic engineer isolates an autonomously replicating,...
A genetic engineer isolates an autonomously replicating, extrachromosomal genetic element from a bacterial cell to use as a cloning vector. Which of the following represents the typical biochemical nature of this isolated element?
Options
- ADouble-stranded linear DNA
- BSingle-stranded circular DNA
- CDouble-stranded circular DNA
- DDouble-stranded circular RNA
Correct answer
C. Double-stranded circular DNA
Step-by-step solution
The autonomously replicating, extrachromosomal genetic element isolated from a bacterial cell is a plasmid.
Plasmids are typically small, double-stranded, circular DNA molecules that exist independently of the chromosomal DNA in bacteria.
They are widely used as cloning vectors in genetic engineering because they can carry foreign genetic material into another cell and replicate autonomously.
Answer: Double-stranded circular DNA
Plasmids are typically small, double-stranded, circular DNA molecules that exist independently of the chromosomal DNA in bacteria.
They are widely used as cloning vectors in genetic engineering because they can carry foreign genetic material into another cell and replicate autonomously.
Answer: Double-stranded circular DNA