Hook
basal portion of bacterial flagellum, to which is distally attached the flagellin filament. Proximally the hook is attached to the rotating spindle of the motor. In some bacteria (Myxobacteria) the rotation of the hook itself (without an attached flagellum) may directly cause forward gliding movement.
This tutorial deals with the structure and function of flowers, fruits, and seeds. Also included here are the types of fruits, fruit dispersal mechanisms, and seed germination. The distinctions between dicots and monocots, the two major groups of flowering plants, are presented in this tutorial...
A running water environment offers numerous microhabitats for many types of animals. Similar to plants, animals in lotic communities have acquired evolutionary adaptations to better suit this running water environment. Know more about their evolutionary adaptations in this tutorial...