_________ are self-replicating, extrachromosomal segments of double-stranded circular and naked DNA, present in a bacterial cell.

Plasmids

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Nucleoid

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Mesosomes

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Bacteriophages

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Solution

The correct option is B Plasmids
Plasmid is a structure in a bacterial cell consisting of DNA that can exist and replicate independently of the chromosome. Plasmids provide genetic instructions for certain cell activities (e.g., antibiotic resistance). They can be transferred from cell to cell in a bacterial colony.
So, the correct answer is 'Plasmids'.

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