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Cells that lack a membrane-bound nucleus are called prokaryotes (from the Greek meaning before nuclei). These cells have few internal structures that are distinguishable under a microscope. Cells in the monera kingdom such as bacteria and cyanobacteria (also known as blue-green algae) are prokaryotes.

Prokaryotic cells differ significantly from eukaryotic cells. They don't have a membrane-bound nucleus and instead of having chromosomal DNA, their genetic information is in a circular loop called a plasmid. Bacterial cells are very small, roughly the size of an animal mitochondrion (about 1-2µm in diameter and 10 µm long). Prokaryotic cells feature three major shapes: rod shaped, spherical, and spiral. Instead of going through elaborate replication processes like eukaryotes, bacterial cells divide by binary fission.

Diagram of a prokaryotic cell. Notice the internal organelles are not easily distinguishable.

Bacteria perform many important functions on earth. They serve as decomposers, agents of fermentation, and play an important role in our own digestive system. Also, bacteria are involved in many nutrient cycles such as the nitrogen cycle, which restores nitrate into the soil for plants. Unlike eukaryotic cells that depend on oxygen for their metabolism, prokaryotic cells enjoy a diverse array of metabolic functions. For example, some bacteria use sulfur instead of oxygen in their metabolism.They are usually very small in size as compared to eukaryotic celles

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Related Questions

What characteristics do Monera and Prokaryocytes share?

Prokaryotes are part of the Monera kingdom. They have the same characteristics.


What is a characteristics prokaryotic?

Prokaryotes do not have a membrane-bound nucleus or other membrane-bound organelles.


Does a eurokaryote have a nucleus?

Yes, eukaryotes have a nucleus. On the other hand, prokaryotes do not have a nucleus. Eukaryotes also have numerous other characteristics not found in prokaryotes, the nucleus is simply the most well known.


Do Prokaryotes have Prokaryotes?

yes prokaryotes have prokaryotes


What are the key characteristics of eukaryotic organisms and how do they differ from prokaryotes?

Eukaryotic organisms have a defined nucleus and membrane-bound organelles, while prokaryotes lack a nucleus and organelles. Eukaryotes are typically larger and more complex than prokaryotes, with a linear DNA structure and the ability to undergo sexual reproduction.


What is another word for prokaryotes?

Bacteria is also known as prokaryotes Bacteria is also known as prokaryotes


The other domain of unicellular prokaryotes?

The other domain of unicellular prokaryotes is Archaea. Archaea are a distinct group of single-celled organisms that have characteristics of both bacteria and eukaryotes. They are known for their ability to thrive in extreme environments, such as hot springs and deep-sea vents.


What kinds of organisms are prokaryotes?

Prokaryotes are bacteria.


Are prokaryotes living organisms?

Bacterium are prokaryotes


What living organisms are prokaryotes?

Bacterium are prokaryotes


How many cells do organisms that are prokaryotes have?

Prokaryotes are singular celled organisms. Bacteria (mainly)are known as Prokaryotes.


Difference in prokaryotes and eukaryotes with photosynthsis?

prokaryotes have a nucleas