BIO 1130 Study Guide - Final Guide: Cyanobacteria, Centrosome, Malaria

• School: University of Ottawa
• Department: Biology
• Course: BIO 1130
• Professor: Jon Houseman

Document Summary

Unikonts only have one flagella & have genes for thymidylate synthase and diyhydrofolate reductase that remain separate but bikonts have the two fused together. Because the two genes remain separate in unikonts & fusion is a derived condition, the implication is that unikonts came before bikont protists. Evidence suggests bikonts had a marine origin & unikonts first appeared in soil or freshwater --- contractile vacuole that freshwater protists have would have been an ancestral organelle lost in marine bikonts. They retained the flagellum in the posterior position. Amoebozoa are opsthokonts that lost their anterior flagellum & instead developed diff. way of moving pseudopods with actin filaments and myosin motors rather than microtubules. Posterior flagellum inside a cellar groove created water currents for feeding and this group became excavata. In corticates, a flagellum with hairs and cortical alveoli reinforced strength and strengthened cell mem. Made powerful swimming strokes possible--- primary endosymbiosis with a cyanobacterium created archaeplastida.