17. Pili represent (1) Extra chromosomal genetic elements (2) Protoplasmic outgrowths of donor cells (3) Small flagella (4) Special bacterial cilia
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(2) Protoplasmic outgrowths of donor cells
Explanation:
Pili are the hair-like appendages found on the surface of many bacteria and archaea. Pili is a protoplasmic outgrowth from bacteria that transfers the genetic material to another bacterial cell. Pili serves many functions in bacteria. They help to swarm bacteria to adhere to the surface, also have a role in DNA transfer (conjugation), and in import and export.
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