Have you ever seen a kinesin protein movement? (You can look it up on Youtube.) It looks theatrical… animated. Two tiny “feet” taking alternating steps along a thin filament, carrying a microscopic “package” through the interior of a cell. It “walks”, weaving through what looks like an entire city. Except, of course, it isn’t a city… it’s you.
Every second of your life, trillions of these molecular machines are walking inside your body. Every cell contains an elaborate transportation network called the cytoskeleton. Running throughout it are microscopic tubes known as microtubules, which function like highways connecting one side of the cell to the other.
Those highways are busy. Mitochondria need to be delivered where energy is required. Vesicles filled with neurotransmitters must reach the ends of nerve cells. Proteins, RNA, and countless other cellular supplies all have destinations. Diffusion alone would be far too slow. So evolution built “transportation”.
Kinesin.
