Prokaryote
an organism whose cells LACK a nucleus & organelles enclosed by membranes
Prokaryotes are unicellular organisms that lack a nucleus and other membrane-bound organelles. They are one of the two broadest categories of living organisms, the other being eukaryotes.
Prokaryotes are found in almost every environment on Earth including extreme environments such as thermal vents, salt flats, and frozen tundras. They can be classified into two domains: Bacteria and Archaea.
Bacteria are the most common and well-known type of prokaryote. They are tiny in size, usually less than 5 micrometers. Some bacteria are helpful and play an important role in our ecosystem, such as decomposing dead plants and animals, while others can cause disease. The study of bacteria is known as bacteriology.
Archaea are another type of prokaryotic organisms that are often found in extreme environments like hydrothermal vents, acidic environments, and saline environments. Archaea have different metabolic pathways and structures that distinguish them from bacteria. Unlike bacteria, they do not cause disease.
In summary, prokaryotes are unicellular organisms that lack a nucleus and membrane-bound organelles. They are classified as either bacteria or archaea and play an important role in our ecosystem. The study of prokaryotes is important for understanding their impact on our environment and their potential uses in biotechnology and medicine.
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