Bacteria on cell membrane posses numerous fine hair like structures which are 3 to 25 nm in diameter and 0.5to 20 um in length . It is also made up of protein called pillin. There are different types of pilli on the basis of their function. One type of pilli is called ‘f’ or sex-pilli which help in sexual reproduction by forming conjugation tube to transfer DNA from donor to receipient. There are also another type of pilli which help the bacteria to come near the surface of liquid where it can get oxygen. There are also third type of pilli which help to attach the bacteria to tissue and suck nutrients from tissue of plants and animals.
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