Cilia
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No, pili and cilia are not the same thing. Pili are short, hair-like structures found on the surface of bacteria that help with attachment and DNA transfer. Cilia, on the other hand, are longer, hair-like structures found on eukaryotic cells that are involved in movement and sensing the environment.
With the "coarse" adjustment, the adjustment mechanism causes a large amount of movement in the thing being adjusted with very little movement of the adjusting mechanism. With the "fine" adjustment, the adjustment mechanism causes a small amount of movement in the thing being adjusted with a lot of movement of the adjusting mechanism. Frequently the two adjustments will be two knobs each with different gearing - say on a telescope focus mechanism. The coarse adjustment allows the telescope focus to be moved quickly then the fine adjustment allows the observer to gently bring the focus to be "pin sharp".
structures is a object or a thing that has more then one object in it
A cell is the basic unit of structure for living things
Chemically both are same, surfactants. Their structures are 'designed' for particular applications.