In eukaryotes, they are the longer of two types of structures that are composed of a "nine plus two" arrangement of microtubules.
Spirochetes (SPY-ro-KEATS) have modified versions of these structures known as axial filaments. In bacteria, the hook, or base of this organelle, is covered. This organelle is attached to a basal body. In eukaryotes, they are the longer of two types of structures that are composed of a "nine plus two" arrangement of microtubules. Unlike that other structure, cilia, these structures work by rotating in a clockwise or counterclockwise manner. For 10 points, name these whiplike projections that are the main method of cell motility in Euglena and sperm cells.
Spirochetes (SPY-ro-KEATS) have modified versions of these structures known as axial filaments.
{flagella} [or {flagellum}]