Florida Biology EOC Practice Test

The kingdom that is composed of unicellular, prokaryotic organisms differing from bacteria in their genetics and membrane structures is Archaebacteria. This group of organisms is known for their unique biochemical properties that allow them to thrive in extreme environments, such as hot springs or salt lakes. While both Archaebacteria and Bacteria are prokaryotic and unicellular, Archaebacteria have distinct genetic sequences and different lipid compositions in their cell membranes, which sets them apart from Bacteria.

In terms of genetics, Archaebacteria have a more similar structure to eukaryotes than to Bacteria. Their ribosomal RNA sequences and some metabolic pathways exhibit significant differences compared to those of Bacteria, reflecting the evolutionary divergence that has occurred between these two domains of life. This highlights the importance of understanding the diverse adaptations and evolutionary history of organisms within these kingdoms.

Other choices represent major groups of life forms that do not align with the characteristics defined in the question. For example, Animalia includes multicellular, eukaryotic organisms, while Protista is primarily composed of eukaryotic, mostly unicellular organisms as well, but lacks the specific features unique to Archaebacteria. Hence, Archaebacteria is