How to use your textbook ? The CHAPTER OUTLINE provides an overview of the chapter’s main concepts. SECTION NUMBERS keyde to page numbers provide easy reference points. The WORKING GLOSSARY provides definitions of important terms within each chapter. (Brock Biology of Microorganisms, Ninth Edition)How to use your textbook ? The CHAPTER OUTLINE provides an overview of the chapter’s main concepts. SECTION NUMBERS keyde to page numbers provide easy reference points. The WORKING GLOSSARY provides definitions of important terms within each chapter. (Brock Biology of Microorganisms, Ninth Edition)