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#domain classification

2 public questions tagged with this topic.

Protista Classification

Protists are primarily classified under the domain

Despite immense morphological diversity, protists share essential eukaryotic cellular organization: nucleus bounded by double membrane with nuclear pores, mitochondria or reduced mitosomes, 80S ribosomes, and cytoskeletal elements. Molecular phylogeny based on SSU rRNA places them within domain Eukarya alongside plants, fungi, and animals. Former kingdom Protista is now recognized as paraphyletic grades distributed across multiple supergroups SAR, Archaeplastida, Amoebozoa, and Excavata, but domain assignment remains Eukarya. Bacteria and Archaea domains contain only prokaryotes lacking nuclear envelope. Thus ribosomal signatures define protists as eukaryotes, not separate domain named Protista.

Ref: Woese 1990 Eukarya domain contains protists; NCERT Class 11 Chapter 2 Protista under Eukarya; Campbell Biology Chapter 26 domain assignment

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Protista Classification

Which domain includes protists, plants, fungi and animals?

Domain Eukarya encompasses all organisms possessing true membrane-bound nucleus enclosing linear chromosomes complexed with histones, plus endomembrane system including endoplasmic reticulum, Golgi, and mitochondria or derived hydrogenosomes. Membership includes diverse protistan lineages, green plants deriving from primary endosymbiosis of cyanobacterium, multicellular fungi with absorptive nutrition and chitinous walls, and animals with collagen, nervous systems, and embryogenesis. Unified by eukaryotic signature proteins such as ubiquitin, spliceosome, and actin-tubulin cytoskeleton, molecular phylogeny places protists as grade leading to other kingdoms, yet all belong within single eukaryotic domain distinct from prokaryotes.

Ref: Campbell Biology 12th ed., Chapter 26 Domain Eukarya includes protists plants fungi animals; OpenStax Biology Eukarya diversity

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