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Question

Assertion: Pili are tubular structures present in bacteria which help in conjugation.

Reason: Formation of pili is controlled by F+ or fertility factor.

A
Both assertion and reason are true and reason is the correct explanation of assertion
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B
Both assertion and reason are true but reason is not the correct explanation of assertion
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C
Assertion is true but reason is false
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D
Both assertion and reason are false
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Solution

The correct option is A Both assertion and reason are true and reason is the correct explanation of assertion
Cells carrying the F plasmid (fertility factor) promote the synthesis of pili (singular, pilus) on the bacterial cell surface. Pili are minute proteinaceous tubules that allow the F+ cells to attach to other cells and maintain contact with them; that is, to conjugate.

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