BIOLOGY 1B Chapter Notes - Chapter 1: Pathogenic Bacteria, Brown Algae, Mycosis
Document Summary
Bacteria are the most diverse and widespread prokaryotes. Eukarya includes three kingdoms of multicellular eukaryotes: plantae, fungi, and animalia. Protists may be closer related to plants, animals, or fungi than they are to other protists so the taxonomic trend has been to split the protists into several kingdoms. Kingdom fungi is defined by the nutritional mode of its members which absorb nutrients from outside their bodies. Structure and function of dna demonstrates the unity among all organisms. Metabolic cooperation between different prokaryotic species often occurs in surface-coating colonies known as biofilms. Cells in a biofilm secrete signaling molecules that recruit nearby cells, causing the colonies to grow. Cells produce polysaccharides and proteins that stick the cells to the substrate and to another. Channels in the biofilm allow nutrients to reach cells in the interior and wastes to be expelled. Chlamydia -- parasites that can survive only within animal cells depending on their hosts for resources as basic as atp.
