When DNA unpacks itself from tightly wound chromosomes during cell division and gets twisted and tangled, like yarn carelessly pulled from a hank, helicase makes a cut in the DNA, allows it to spin and untwist, then repairs the cut. Nifty.
Kinesins, on the other hand, are crawlers. During cell division, they drag replicated chromosomes into one of the two new cells. Using cellular rope called "microtubules," kinesins alternatively grasp, pull and let go - hand over hand - to draw the chromosomes into position. There are 124 different types of kinesins in a cell. Very cool.