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. If both assertion and reason are true and reason is the correct explanation of assertion
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false
• D. If both assertion and reason are false

Answer 1

Answer: (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