abundant and diverse organisms that lack membrane bound organelles
Unicellular organism Prokaryotes lack membrane-bound organelles, such as mitochondria or a nucleus.[7] Instead, most prokaryotes have an irregular region that contains DNA, known as the nucleoid.[8] Most prokaryotes have a single, circular chromosome, which is in contrast to eukaryotes, which typically have linear chromosomes.[9] Nutritionally, prokaryotes have the ability to utilize a wide range of organic and inorganic material for use in metabolism, including sulfur, cellulose, ammonia, or nitrite.[10] Prokaryotes as a whole are ubiquitous in the environment and exist in extreme environments as well.