2) Advances in molecular machinery have afforded various approaches toward performing macroscopic like tasks at the molecular level. Fort o mimick the motion of vehicles at the molecular level nano vehicles have been designed and developed. Nano worms are a design of a nano vehicles that mmick caterpillar-like motion.

a) Is this approach toward molecular machines a bottom-upor top-down approach? Why? b) Why dould these molecules exhibit caterpillar-like motion? c) Would there be a directional motion of these molecules on a surface? If yes indicate the-expected direction of motion via arrows. d) Why does the motion of these molecules need to be studied on a surface?