Eukaryotic cells are distinguished from prokaryotes by the presence of a more complex and The and membrane infoldings. evolved from engulfed bacteria. evolved from engulfed bacteria. What is the name of the process believed to have led to the evolution of mitochondria and chloroplasts? 2 Overview of Protists A eukaryotic organism is considered to be a protist if it lacks features that would place it with the , or Many protists are but numerous colonial and groups exist. Eukaryotes are organized into supergroups. is helping to sort out the evolutionary relationships among protists. .