Question

What does a flagellum do to a prokaryote?

Answer 1

It moooooves it.

Explanation:

This is an interesting question that we can answer by drawing similarities to other organisms.

If you look at a flagellum on a prokaryote (not with your eyes silly, take out the microscope!), you'll see this tail-thingamabob that wags around.

Let's look at something similar: A fish. Fish have fins and and tails, which we know they use to push back the medium they swim through (ahem, water) in order to... well, swim.

This is really the same thing with flagella. It's able to wiggle and flap around in order to push the prokaryote forwards. We also see this same structure with analogous function in bacterium (which is in fact a prokaryote) and sperm (which is a unicellular eukaryote).