Both organisms are composed of cells, the basic unit of life, with each cell surrounded by a cell membrane. The biggest difference between prokaryotes and eukaryotes is that eukaryotes have a nucleus. They also have other membrane structures called organelles.
Your body’s composed of trillions of cells – lots of different types of cells that make up different organs and other parts of your body. Your body is also where 10 times that number of bacteria call ‘home sweet home.’ But, don’t be afraid – these bacteria do more good than harm to you. And besides, just in case you wanted to strike up a conversation with your tenants, you and your bacteria do have a few things in common.