Biology : PU-CET (U.G) 2018 Panjab University Entrance Exam With Answers

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14.

Which Of The Following Is A Wrong Statement ?

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.
The fimbriae are elongated tubular structures made of a special protein.

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

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

C: Assertion is correct but Reason is incorrect

D: Both Assertion and Reason are incorrect

The answer is: D

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Explanation

Correct option is D)

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'.