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Which option gives the correct basic structure of a plasmid vector?

Answer and explanation

Correct answer: Small circular double-stranded DNA

The direct answer is A: a plasmid vector is usually a small, circular, double-stranded DNA molecule. To understand this, a plasmid is an extra DNA molecule found independently of the main bacterial chromosome. It can often replicate because it has an origin of replication, and a vector may also contain a selectable marker and cloning site. Option A is correct because it describes the basic physical form of most plasmid vectors. Option B is wrong because a protein chain is not DNA and cannot itself be called a plasmid. Option C is wrong because a fat droplet is a lipid structure, not genetic material. Option D is wrong because chlorophyll is a pigment involved in photosynthesis, not the structure of a vector. Some special plasmids may differ in details, but the basic school-level description remains circular double-stranded DNA. Memory cue: plasmid equals small extra ring of DNA.

Related tags

Plasmid StructureCircular DnaDouble Stranded

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