Define the following terms: Chapter 1 Bacteria – small single-celled organism, no nucleus Archaea – single- celled organism, no nuclei, prokaryotes Fungi – EUKARYOTIC , CONTAINS A NUCLEUS COMPOSED OF GENETIC MATERIAL Protozoa – SINGLE-CELLED EUKARYOTES SIMILAR TO ANIMALS Algae – UNICELLULAR PHTOSYNTHETIC EUKARYOTES Virus – infectious agent, replicates inside of the living cell, acellular, surrounded by protein coat