Microbiology, 2021

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634 15 • Microbial Mechanisms of Pathogenicity membrane of gram-negative bacteria is called endotoxin (Figure 15.13). During infection and disease, gramnegative bacterial pathogens release endotoxin either when the cell dies, resulting in the disintegration of the membrane, or when the bacterium undergoes binary fission. The lipid component of endotoxin, lipid A, is responsible for the toxic properties of the LPS molecule. Lipid A is relatively conserved across different genera of gram-negative bacteria; therefore, the toxic properties of lipid A are similar regardless of the gram-negative pathogen. In a manner similar to that of tumor necrosis factor, lipid A triggers the immune system’s inflammatory response (see Inflammation and Fever). If the concentration of endotoxin in the body is low, the inflammatory response may provide the host an effective defense against infection; on the other hand, high concentrations of endotoxin in the blood can cause an excessive inflammatory response, leading to a severe drop in blood pressure, multi-organ failure, and death. Figure 15.13 Lipopolysaccharide is composed of lipid A, a core glycolipid, and an O-specific polysaccharide side chain. Lipid A is the toxic component that promotes inflammation and fever. A classic method of detecting endotoxin is by using the Limulus amebocyte lysate (LAL) test. In this procedure, the blood cells (amebocytes) of the horseshoe crab (Limulus polyphemus) is mixed with a patient’s serum. The amebocytes will react to the presence of any endotoxin. This reaction can be observed either chromogenically (color) or by looking for coagulation (clotting reaction) to occur within the serum. An alternative method that has been used is an enzyme-linked immunosorbent assay (ELISA) that uses antibodies to detect the presence of endotoxin. Unlike the toxic lipid A of endotoxin, exotoxins are protein molecules that are produced by a wide variety of living pathogenic bacteria. Although some gram-negative pathogens produce exotoxins, the majority are produced by gram-positive pathogens. Exotoxins differ from endotoxin in several other key characteristics, summarized in Table 15.9. In contrast to endotoxin, which stimulates a general systemic inflammatory response when released, exotoxins are much more specific in their action and the cells they interact with. Each exotoxin targets specific receptors on specific cells and damages those cells through unique molecular mechanisms. Endotoxin remains stable at high temperatures, and requires heating at 121 °C (250 °F) for 45 minutes to inactivate. By contrast, most exotoxins are heat labile because of their protein structure, and many are denatured (inactivated) at temperatures above 41 °C (106 °F). As discussed earlier, endotoxin can stimulate a lethal inflammatory response at very high concentrations and has a measured LD 50 of 0.24 mg/kg. By contrast, very small concentrations of exotoxins can be lethal. For example, botulinum toxin, which causes botulism, has an LD 50 of 0.000001 mg/kg (240,000 times more lethal than endotoxin). Comparison of Endotoxin and Exotoxins Produced by Bacteria Characteristic Endotoxin Exotoxin Source Gram-negative bacteria Gram-positive (primarily) and gram-negative bacteria Composition Lipid A component of lipopolysaccharide Protein Effect on host General systemic symptoms of inflammation and fever Specific damage to cells dependent upon receptormediated targeting of cells and specific mechanisms of action Heat stability Heat stable Most are heat labile, but some are heat stable Access for free at openstax.org.
15.3 • Virulence Factors of Bacterial and Viral Pathogens 635 Comparison of Endotoxin and Exotoxins Produced by Bacteria Characteristic Endotoxin Exotoxin LD 50 High Low Table 15.9 The exotoxins can be grouped into three categories based on their target: intracellular targeting, membrane disrupting, and superantigens. Table 15.10 provides examples of well-characterized toxins within each of these three categories. Some Common Exotoxins and Associated Bacterial Pathogens Category Example Pathogen Mechanism and Disease Cholera toxin Vibrio cholerae Activation of adenylate cyclase in intestinal cells, causing increased levels of cyclic adenosine monophosphate (cAMP) and secretion of fluids and electrolytes out of cell, causing diarrhea Intracellulartargeting toxins Tetanus toxin Botulinum toxin Clostridium tetani Clostridium botulinum Inhibits the release of inhibitory neurotransmitters in the central nervous system, causing spastic paralysis Inhibits release of the neurotransmitter acetylcholine from neurons, resulting in flaccid paralysis Diphtheria toxin Corynebacterium diphtheriae Inhibition of protein synthesis, causing cellular death Streptolysin Streptococcus pyogenes Pneumolysin Streptococcus pneumoniae Proteins that assemble into pores in cell membranes, disrupting their function and killing the cell Membranedisrupting toxins Alpha-toxin Alpha-toxin Staphylococcus aureus Clostridium perfringens Phospholipase C Pseudomonas aeruginosa Phospholipases that degrade cell membrane phospholipids, disrupting membrane function and killing the cell Beta-toxin Staphylococcus aureus
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Microbiology SENIOR CONTRIBUTING AU
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OPENSTAX OpenStax provides free, pe
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Contents Preface 1 CHAPTER 1 An Inv
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9.2 Oxygen Requirements for Microbi
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18.1 Overview of Specific Adaptive
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Appendix C Metabolic Pathways 1155
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Preface 1 PREFACE Welcome to Microb
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Preface 3 that often confer critica
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Preface 5 further. Our features inc
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Preface 7 and science, and pursues
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CHAPTER 1 An Invisible World Figure
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1.1 • What Our Ancestors Knew 11
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1.2 • A Systematic Approach 17 Th
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1.2 • A Systematic Approach 19 Fi
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1.2 • A Systematic Approach 21 Ta
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1.3 • Types of Microorganisms 23
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1 • Summary 31 SUMMARY 1.1 What O
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1 • Review Questions 33 17. The p
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CHAPTER 2 How We See the Invisible
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2.1 • The Properties of Light 37
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2.1 • The Properties of Light 39
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2.2 • Peering Into the Invisible
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2.3 • Instruments of Microscopy 4
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2.4 • Staining Microscopic Specim
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2 • Review Questions 71 REVIEW QU
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CHAPTER 3 The Cell Figure 3.1 Micro
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3.1 • Spontaneous Generation 75 F
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3.2 • Foundations of Modern Cell
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3.3 • Unique Characteristics of P
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3.4 • Unique Characteristics of E
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3 • Summary 125 SUMMARY 3.1 Spont
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3 • Review Questions 127 3. Which
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3 • Review Questions 129 Critical
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CHAPTER 4 Prokaryotic Diversity Fig
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4.1 • Prokaryote Habitats, Relati
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4.2 • Proteobacteria 139 for or s
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4.2 • Proteobacteria 141 Class Al
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4.2 • Proteobacteria 143 Class Be
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4.2 • Proteobacteria 145 Figure 4
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4.2 • Proteobacteria 147 Class Ga
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4.3 • Nonproteobacteria Gram-Nega
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4.4 • Gram-Positive Bacteria 157
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4.6 • Archaea 167 The class Therm
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4.6 • Archaea 169 thus is a livin
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4 • Summary 171 SUMMARY 4.1 Proka
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4 • Review Questions 173 REVIEW Q
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4 • Review Questions 175 39. Expl
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CHAPTER 5 The Eukaryotes of Microbi
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5.1 • Unicellular Eukaryotic Para
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Figure 5.7 5.1 • Unicellular Euka
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5.2 • Parasitic Helminths 193 hel
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5.2 • Parasitic Helminths 195 Fig
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5.2 • Parasitic Helminths 197 Fig
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5.2 • Parasitic Helminths 199 MIC
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5.3 • Fungi 201 Figure 5.25 Multi
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5.3 • Fungi 203 Figure 5.27 zygos
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5.3 • Fungi 205 diploid stages (F
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5.3 • Fungi 207 Figure 5.32 prese
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5.3 • Fungi 209 MICRO CONNECTIONS
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5.4 • Algae 211 and other photosy
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5.5 • Lichens 213 Figure 5.37 Chl
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5.5 • Lichens 215 marina. (b) Thi
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5 • Review Questions 217 REVIEW Q
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CHAPTER 6 Acellular Pathogens Figur
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6.1 • Viruses 221 assembly of vir
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6.1 • Viruses 223 Viral Structure
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6.1 • Viruses 225 Figure 6.5 (a)
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6.1 • Viruses 227 LINK TO LEARNIN
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6.2 • The Viral Life Cycle 229 on
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6.2 • The Viral Life Cycle 231 Fi
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6.2 • The Viral Life Cycle 237 by
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6.2 • The Viral Life Cycle 239 Ca
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6.3 • Isolation, Culture, and Ide
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6.4 • Viroids, Virusoids, and Pri
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6.4 • Viroids, Virusoids, and Pri
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6 • Summary 253 SUMMARY 6.1 Virus
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6 • Review Questions 255 18. A/an
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CHAPTER 7 Microbial Biochemistry Fi
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7.1 • Organic Molecules 259 Figur
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7.1 • Organic Molecules 261 Figur
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7.2 • Carbohydrates 263 and the m
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7.2 • Carbohydrates 265 Figure 7.
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7.3 • Lipids 267 Figure 7.11 Star
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7.3 • Lipids 269 Figure 7.13 This
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7.3 • Lipids 271 Figure 7.15 Five
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7.4 • Proteins 273 Figure 7.17 Am
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7.4 • Proteins 275 Figure 7.19 Re
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7.4 • Proteins 277 Figure 7.23 Pr
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7.5 • Using Biochemistry to Ident
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7.5 • Using Biochemistry to Ident
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7 • Review Questions 283 as hormo
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7 • Review Questions 285 19. A tr
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CHAPTER 8 Microbial Metabolism Figu
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8.1 • Energy, Matter, and Enzymes
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8.2 • Catabolism of Carbohydrates
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8.3 • Cellular Respiration 301 8.
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8.3 • Cellular Respiration 303 Fi
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8.4 • Fermentation 305 If respira
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8.4 • Fermentation 307 Common Fer
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8.5 • Catabolism of Lipids and Pr
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8.6 • Photosynthesis 311 independ
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8.6 • Photosynthesis 313 Oxygenic
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8.7 • Biogeochemical Cycles 315 L
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8.7 • Biogeochemical Cycles 317 N
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8.7 • Biogeochemical Cycles 319 F
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8.7 • Biogeochemical Cycles 321 F
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8 • Summary 323 oxygen as the fin
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8 • Review Questions 325 4. To wh
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8 • Review Questions 327 Matching
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CHAPTER 9 Microbial Growth Figure 9
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9.1 • How Microbes Grow 331 and a
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9.1 • How Microbes Grow 333 The G
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9.1 • How Microbes Grow 335 Susta
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9.1 • How Microbes Grow 337 chang
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9.1 • How Microbes Grow 339 Figur
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9.1 • How Microbes Grow 341 trans
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9.1 • How Microbes Grow 343 micro
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9.2 • Oxygen Requirements for Mic
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9.3 • The Effects of pH on Microb
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9.4 • Temperature and Microbial G
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9.4 • Temperature and Microbial G
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9.5 • Other Environmental Conditi
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9.6 • Media Used for Bacterial Gr
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9 • Summary 361 SUMMARY 9.1 How M
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9 • Review Questions 363 7. Filam
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9 • Review Questions 365 Matching
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9 • Review Questions 367 Critical
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CHAPTER 10 Biochemistry of the Geno
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10.1 • Using Microbiology to Disc
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10.2 • Structure and Function of
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10 • Summary 401 SUMMARY 10.1 Usi
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10 • Review Questions 403 3. Whic
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10 • Review Questions 405 Short A
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CHAPTER 11 Mechanisms of Microbial
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11.1 • The Functions of Genetic M
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11.2 • DNA Replication 411 Figure
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11.2 • DNA Replication 413 Figure
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11.2 • DNA Replication 415 strand
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11.2 • DNA Replication 417 telome
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11.3 • RNA Transcription 419 Figu
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11.3 • RNA Transcription 421 the
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11.4 • Protein Synthesis (Transla
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11.5 • Mutations 429 Effects of M
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11.5 • Mutations 431 In recent ye
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11.5 • Mutations 433 Figure 11.20
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11.5 • Mutations 435 formation of
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11.6 • How Asexual Prokaryotes Ac
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11.7 • Gene Regulation: Operon Th
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11 • Summary 457 SUMMARY 11.1 The
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11 • Summary 459 undamaged DNA st
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11 • Review Questions 461 11. Whi
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11 • Review Questions 463 46. ___
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71. The following figure is from Mo
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CHAPTER 12 Modern Applications of M
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12.1 • Microbes and the Tools of
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12.2 • Visualizing and Characteri
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12.3 • Whole Genome Methods and P
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12.3 • Whole Genome Methods and P
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12.4 • Gene Therapy 499 Figure 12
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12.4 • Gene Therapy 501 overall w
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12 • Summary 503 SUMMARY 12.1 Mic
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12 • Review Questions 505 11. The
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CHAPTER 13 Control of Microbial Gro
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13.1 • Controlling Microbial Grow
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13.2 • Using Physical Methods to
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13.3 • Using Chemicals to Control
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13.4 • Testing the Effectiveness
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13 • Summary 553 commonly used to
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13 • Review Questions 555 12. Ble
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CHAPTER 14 Antimicrobial Drugs Figu
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14.1 • History of Chemotherapy an
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14.1 • History of Chemotherapy an
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14.2 • Fundamentals of Antimicrob
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14.2 • Fundamentals of Antimicrob
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14.3 • Mechanisms of Antibacteria
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14.4 • Mechanisms of Other Antimi
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17.1 • Physical Defenses 685 Over
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17.1 • Physical Defenses 687 know
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17.1 • Physical Defenses 689 Figu
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17.2 • Chemical Defenses 691 Phys
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17.2 • Chemical Defenses 693 sali
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17.2 • Chemical Defenses 695 prod
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17.2 • Chemical Defenses 697 Figu
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17.2 • Chemical Defenses 699 Clin
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17.3 • Cellular Defenses 701 Hema
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17.3 • Cellular Defenses 703 stra
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17.3 • Cellular Defenses 705 Clin
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17.3 • Cellular Defenses 707 Figu
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17.4 • Pathogen Recognition and P
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17.5 • Inflammation and Fever 713
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17 • Summary 719 SUMMARY 17.1 Phy
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17 • Review Questions 721 8. Hist
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17 • Review Questions 723 Short A
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CHAPTER 18 Adaptive Specific Host D
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18.1 • Overview of Specific Adapt
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18.2 • Major Histocompatibility C
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18.3 • T Lymphocytes and Cellular
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18.4 • B Lymphocytes and Humoral
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18.4 • B Lymphocytes and Humoral
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18.5 • Vaccines 751 pathogen—bu
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18.5 • Vaccines 753 Eye on Ethics
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18.5 • Vaccines 755 for Disease C
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18.5 • Vaccines 757 Classes of Va
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18 • Summary 759 SUMMARY 18.1 Ove
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18 • Review Questions 761 5. MHC
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18 • Review Questions 763 20. Mat
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CHAPTER 19 Diseases of the Immune S
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19.1 • Hypersensitivities 767 Fig
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19.1 • Hypersensitivities 769 bin
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19.1 • Hypersensitivities 771 mec
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19.1 • Hypersensitivities 775 CHE
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19.1 • Hypersensitivities 777 Cli
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19.1 • Hypersensitivities 779 MIC
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19.2 • Autoimmune Disorders 783 t
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19.2 • Autoimmune Disorders 785 F
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19.2 • Autoimmune Disorders 789 F
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19.3 • Organ Transplantation and
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19.4 • Immunodeficiency 793 and m
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19.4 • Immunodeficiency 795 CHECK
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19.5 • Cancer Immunobiology and I
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19 • Summary 799 SUMMARY 19.1 Hyp
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19 • Review Questions 801 13. All
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CHAPTER 20 Laboratory Analysis of t
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20.3 • Agglutination Assays 823 a
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20.3 • Agglutination Assays 825 F
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20.3 • Agglutination Assays 829 s
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20.4 • EIAs and ELISAs 831 Mechan
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20.4 • EIAs and ELISAs 833 Figure
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20 • Review Questions 849 20.4 EI
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20 • Review Questions 851 15. Sup
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CHAPTER 21 Skin and Eye Infections
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21.5 • Protozoan and Helminthic I
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21 • Summary 891 SUMMARY 21.1 Ana
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CHAPTER 22 Respiratory System Infec
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Figure 22.29 22.4 • Respiratory M
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22 • Review Questions 939 200 vir
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CHAPTER 23 Urogenital System Infect
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23 • Summary 975 SUMMARY 23.1 Ana
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CHAPTER 24 Digestive System Infecti
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24.2 • Microbial Diseases of the
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24.4 • Viral Infections of the Ga
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24.6 • Helminthic Infections of t
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24 • Summary 1033 SUMMARY 24.1 An
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CHAPTER 25 Circulatory and Lymphati
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25.1 • Anatomy of the Circulatory
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25.1 • Anatomy of the Circulatory
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25.3 • Viral Infections of the Ci
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Figure 25.26 25.3 • Viral Infecti
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25.4 • Parasitic Infections of th
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25 • Review Questions 1089 • To
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25 • Review Questions 1091 Critic
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CHAPTER 26 Nervous System Infection
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26.1 • Anatomy of the Nervous Sys
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26.1 • Anatomy of the Nervous Sys
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26.2 • Bacterial Diseases of the
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26.3 • Acellular Diseases of the
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Figure 26.19 26.3 • Acellular Dis
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26.4 • Fungal and Parasitic Disea
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26 • Review Questions 1133 are fa
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26 • Review Questions 1135 Matchi
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26 • Review Questions 1137 59. Th
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A • Fundamentals of Physics and C
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B • Mathematical Basics 1149 APPE
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B • Mathematical Basics 1151 Mult
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B • Mathematical Basics 1153 The
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C • Metabolic Pathways 1155 APPEN
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C • Metabolic Pathways 1157 Entne
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C • Metabolic Pathways 1159 Figur
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C • Metabolic Pathways 1161 Elect
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APPENDIX D Taxonomy of Clinically R
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D • Taxonomy of Clinically Releva
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E • Glossary 1177 APPENDIX E Glos
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E • Glossary 1179 destruction by
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E • Glossary 1181 pollutants from
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E • Glossary 1183 chromosome disc
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E • Glossary 1185 cysts are forme
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E • Glossary 1187 occurring ectop
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E • Glossary 1189 molecules of DN
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E • Glossary 1191 glycoprotein co
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E • Glossary 1193 image point is
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E • Glossary 1195 discontinuously
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E • Glossary 1197 infection cause
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E • Glossary 1199 target cells by
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E • Glossary 1201 intact ribosome
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E • Glossary 1203 point source sp
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E • Glossary 1205 complexes forme
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E • Glossary 1207 antibody is fir
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E • Glossary 1209 the number of c
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E • Glossary 1211 the reciprocal
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E • Glossary 1213 vector animal (
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1215 ANSWER KEY Chapter 1 1. D 2. D
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1217 B 18. A, C, B 19. peristalsis
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Index 1219 INDEX Symbols +ssRNA 237
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Index 1221 antigen-presenting cells
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Index 1223 Bordetella 142 Bordetell
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Index 1225 chromosomes 372, 394 chr
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Index 1227 de Duve 113 dead zone 35
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Index 1229 Enteroinvasive E. coli (
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Index 1231 Gardnerella vaginalis 47
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Index 1233 shunt 298 Hfr cell 443 H
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Index 1235 iron lungs 1118 iron-sul
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Index 1237 maturation 230 mature na
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Index 1239 Health 501 National Noti
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Index 1241 patterns (PAMPs) 710 pat
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Index 1243 primary lymphoid tissue
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Index 1245 596, 1048, 1051, 1051 ri
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Index 1247 sterilant 511, 541 steri
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Index 1249 toxigenicity 633 toxin 6
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Index 1251 water activity 522 water
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Microbiology, 2021

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