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 ...

The International Committee on Systematics of Prokaryotes recently pulled the rank of phylum into its code of official nomenclature. Experts say the move will help standardize science in the long run ...

The diversity of gene tree topologies is particularly pronounced among prokaryotes. For example, when scientists build trees for the numerous genes encoding metabolic enzymes or membrane transport ...

Genetic material DNA in a nucleus, plasmids are found in a few simple eukaryotic organisms. DNA is a single molecule, found free in the cytoplasm; additional DNA is found on one or more rings ...