The whale's ability to hold its breath is, in a way, an evolutionary one-two punch: (1) The high concentration of myoglobin allows it to spend more time underwater in between breaths, and (2) the myoglobin's positive charge ensures the proteins don't clump together and kill the animal.
Lesson Summary. Let's review. A flagellum is a whip-like structure that allows a cell to move. They are found in all three domains of the living world: bacteria, archaea, and eukaryota.While all three types of flagella are used for locomotion, they are structurally very different.The eukaryotic flagellum is a long, rod-like structure that is surrounded by an extension of the cell membrane like a sheath.t is similar to a cilium in structure, though cilia generally move in a back and forth motion, as opposed to the corkscrew movement of a flagellum. The eukaryotic flagellum is a long, rod-like structure that is surrounded by an extension of the cell membrane like a sheath.
This comb-back chair, so called for the resemblance of the crest rail to a hair comb, is rare for its highly remarkable revolving mechanism, which probably was specified to the (unidentified) maker by Jefferson. The chair has volute-carved ears at the ends of the crest rail and knuckle handholds on the arms. Unlike most comb-back Philadelphia Windsors, Jefferson's chair has eleven spindles rather than the usual nine forming its back. The seat is round, rather than the customary D-shape with a pommel and dished out seat.