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Question

Assertion :The fimbriae are elongated tubular structures made of a special protein. Reason: The pili are small bristle like fibres sprouting out of the cell.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution

The correct option is D Both Assertion and Reason are incorrect
Pili and fimbriae are surface structures of the bacteria but do not play a role in motility. The pili are elongated tubular structures made of a special protein (pilin). Pili develop in response to F+ or fertility factor in Gram negative bacteria. The fimbriae are small bristle-like fibres sprouting out of the cell. Fimbriae are involved in attaching bacteria to solid surfaces or host tissues. So, the correct answer is 'Both Assertion and Reason are incorrect'.

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