Most cell signals are chemical in nature. For example, prokaryotic organisms have sensors that detect nutrients and help them navigate toward food sources. In multicellular organisms, growth ...

For example, muscle cells in people who exercise regularly possess more mitochondria than muscle cells in sedentary people. Prokaryotes, on the other hand, don't have mitochondria for energy ...

Eukaryotic cell DNA in a nucleus, plasmids are found in a few simple eukaryotic organisms. Prokaryotic cell DNA is a single molecule, found free in the cytoplasm; additional DNA is found on one or ...

Life is composed of three distinct cell types: bacteria and archaea, which are both prokaryotic cells with some key differences — for example in their cell membranes and reproductive strategies — and ...