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Protist Kingdom



Paramecium aurelia: ciliated protozoan of the Protist Kingdom

Introduction (what it is)

The Protist Kingdom encompasses a wide variety of single-cell (single-cell) organisms and some simple forms of multi-core (multi-nucleus) and multicellular (multi-cell) organisms.

Main Features of the Protist Kingdom

The protist kingdom also includes some eukaryotic organisms, these beings have a nucleus surrounded by a cell membrane, DNA associated with histones (the main proteins that make up chromatin and that play an important role in the regulation of genes) and organelles such as mitochondria. and chloroplasts.

Recently a classification system has been proposed that classifies eukaryotic organisms among one of the three main groups of living beings, next to the group of bacteria and archae.

Theoretically, protist organelles are believed to be descended from the specialized evolution of symbiotic bacteria that live inside cells and other bacteria, which contributed, at least in part, to their prokaryote cell transition (membrane-free cells separating the nucleus). from the cytoplasm) to eukaryotic cell (cells with organized nucleus and separated from the cytoplasm by nuclear membrane).

The protist kingdom comprises a diverse number of organisms. From this realm are algae, protozoa and autotrophs (organisms capable of producing their own food through photosynthesis or chemosynthesis) that are multicellular or multinuclear.

Prior to the advent of modern biochemistry and the electron microscope, these organisms were embedded within the realm of plants and animals.

Most protists are now known to have evolved independently.

Curiosity:

Did you know that there are approximately 60,000 species of living beings belonging to the Protist kingdom?