Bacteria are found everywhere. Even in the deep sea vents . They can also cause diseases. The reason I said bacteria are gutless is because they are. They lack certain specialized structures called organelles .
Organelles are like the organs in our bodies.
In addition to the cell nucleus we have the golgi complex, endoplasmic reticulum, and mitochondrian, in our cells. Bacteria live and grow just fine without these organelles . Here is another great site that tells you more about our organelles as well as another organelle that is special to plants . Used under License.