Protist+Cell+Structure

=Protista Structure = ====As previously mentioned, Protista was created to hold aquatic unicellular eukaryotic organisms. So obviously protists have eukaryotic cellular structure. As organisms branching out relatively low on the tree of life (perhaps 2 billion years ago), some of these have some primitive eukaryotic cell structure. This is particularly true of the archezoans. The archezoans are largely parasitic and what characterizes them as a group is that they lack mitochondria, golgi, and peroxisomes. Their ribosomes are 70S (prokaryotic size) rather than 80S (eukaryotic size). It is likely that archezoans are descendants of a group that was only part-way along the path to becoming truly eukaryotic.====