Assertion :Plasmids are found in all prokaryotic cells. Reason: $p B R 322$ is a cloning vector that lacks antibiotic resistance genes.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
The circular or ring like extra chromosomal structures appear in Gram -ve bacteria are called Plasmids. These are found only in G-ve bacteria. PBR322 is a artificially restructured plasmid. It is used as cloning vector in genetic engineering. It contains antibiotic resistance genes.
So, the correct option is 'Both assertion and reason are incorrect'.

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