Some are synthetically made. Penicillin keeps bacteria from being able to divide in most cases. They become sticky and adhere to the inside of the vessel walls. They find, eat, and kill foreign microbes. It is a substance that causes an immune system response.
Bacteria move by using their flagella to propel themselves around.
It surrounds the invading enemy and then kills it. My name is Mary. I have two grown children, both of them married. I have one super grandson. I graduated from college many, many years ago with a B.S. in Biology Education.