Dear experts,
There is some explanations for evolution process of flagellum. ased on these explanations, some bacteria  first developed a non-movable flagellum to achive more food, then they developed a moving mechanism to maximize its performance, and at the end the locomotion ability is achieved by further developing of this mechanism.

Here is the question: why don't we see any bacteria with non-movable flagellum today?


We do, we just don't call them a "non-movable flagellum". Pili are related structures also justing out from the cell. Interestingly, some, but not all of them are capable of a very simple movement - retraction. Other things that evolved from this same structure are secretion systems, where the long hollow rod usually making up the 'whippy' part of the flagellum can be used like a syringe to inject toxins into other cells.

Last edited by Christopher LaRock (24th Apr 2016 03:36:46)