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Question

Which of the following statement about plasmids is true?

A
Plasmid DNA is like phage DNA and needs the bacterial genome for replication
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B
Each bacterial cell can have only one plasmid
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C
Conjugation is one of the natural process through which plasmids can be transferred from one bacteria to another
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D
All plasmids confer antibiotic resistance to the host bacteria
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Solution

The correct option is C Conjugation is one of the natural process through which plasmids can be transferred from one bacteria to another
Plasmids are extrachromosomal circular DNA which are capable of self replication. A bacterial cell can contain numerous small and a few larger plasmids. Conjugation is one of the natural methods through which plasmids can be transferred from one bacteria to another via a conjugation bridge, the other two methods being transformation and transduction. All plasmids do not confer antibiotic resistance.

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