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Questions and Answers
Match the following antibiotic targets with their respective drug classes:
Match the following antibiotic targets with their respective drug classes:
50S subunit = Macrolides Folic Acid synthesis = Sulfamethoxazole Mycolic Acid synthesis = Isoniazid Eukaryotic microorganisms = Imidazoles
Match the following drugs with their primary use:
Match the following drugs with their primary use:
Miconazole = Fungal infections Mefloquine = Malaria treatment Ivermectin = Roundworm diseases Trimethoprim = Folic acid synthesis inhibition
Match the mechanisms of antibiotic resistance with their descriptions:
Match the mechanisms of antibiotic resistance with their descriptions:
Persister cells = Survive antibiotic exposure Superbug evolutions = Resistant to multiple antibiotics Horizontal gene transfer = Gene sharing between bacteria Evolution = Population favoring resistant strains
Match the following statements with the corresponding implications of antibiotic resistance:
Match the following statements with the corresponding implications of antibiotic resistance:
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Match the following drug classes with the specific type of microorganism they target:
Match the following drug classes with the specific type of microorganism they target:
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Match the medical terms with their definitions:
Match the medical terms with their definitions:
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Match the types of noncommunicable diseases with their descriptions:
Match the types of noncommunicable diseases with their descriptions:
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Match the periods of disease with their characteristics:
Match the periods of disease with their characteristics:
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Match the types of diseases with their spread capabilities:
Match the types of diseases with their spread capabilities:
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Match the terms related to disease presentation:
Match the terms related to disease presentation:
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Match the following types of disease prevalence with their definitions:
Match the following types of disease prevalence with their definitions:
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Match the following types of infections with their characteristics:
Match the following types of infections with their characteristics:
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Match the following infection routes with their descriptions:
Match the following infection routes with their descriptions:
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Match the following terms related to infection severity with their definitions:
Match the following terms related to infection severity with their definitions:
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Match the following bacterial diseases with their causative organisms:
Match the following bacterial diseases with their causative organisms:
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Match the following sources of disease with their examples:
Match the following sources of disease with their examples:
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Match the following viral diseases with their causative agents:
Match the following viral diseases with their causative agents:
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Match the following bacterial diseases with their symptoms:
Match the following bacterial diseases with their symptoms:
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Match the following viral diseases with their symptoms:
Match the following viral diseases with their symptoms:
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Match the following bacterial infections with their respective symptoms:
Match the following bacterial infections with their respective symptoms:
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Match the following antibiotics with their respective modes of action:
Match the following antibiotics with their respective modes of action:
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Match the following scientists with their contributions to antimicrobial research:
Match the following scientists with their contributions to antimicrobial research:
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Match the following antibiotics with their specific types:
Match the following antibiotics with their specific types:
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Match the following antimicrobial groups with their target structures:
Match the following antimicrobial groups with their target structures:
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Match the following modes of action to their description:
Match the following modes of action to their description:
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Match the following antimicrobial mechanisms to their functions:
Match the following antimicrobial mechanisms to their functions:
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Match the following antibiotics with the specific bacterial activities they inhibit:
Match the following antibiotics with the specific bacterial activities they inhibit:
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Match the following antimicrobial types with their respective examples:
Match the following antimicrobial types with their respective examples:
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Match the following diseases to their descriptions:
Match the following diseases to their descriptions:
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Match the following organisms to their disease:
Match the following organisms to their disease:
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Match the following disease effects with their respective conditions:
Match the following disease effects with their respective conditions:
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Match the following diseases with their transmission modes:
Match the following diseases with their transmission modes:
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Match these types of pneumonia with their causes:
Match these types of pneumonia with their causes:
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Match the following diseases to potential complications:
Match the following diseases to potential complications:
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Match the following food-related diseases with their characteristics:
Match the following food-related diseases with their characteristics:
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Study Notes
Microbiology Exam 4
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Antibiotics
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Magic Bullet: a chemical that targets a pathogen without harming the host.
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Natural antibiotic: compounds made by microorganisms to kill or inhibit other microorganisms.
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Semisynthetic antimicrobial: modified antimicrobials.
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Spectrum: types of organisms affected by antimicrobials.
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Narrow spectrum antimicrobial: affects only a few types of bacteria.
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Broad spectrum antimicrobial: affects many types of bacteria (gram positive and gram negative).
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Superinfection: Broad spectrum antibiotics kill nonresistant cells allowing drug resistant pathogens to proliferate, causing superinfection.
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Bacteriostatic: inhibits the growth, but does not kill the organism.
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Bactericidal: kills the target organism.
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Kirby-Bauer disk diffusion test: measures the zone of inhibition to determine susceptibility to a drug.
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Mueller-Hinton agar: media used for Kirby-Bauer test.
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Selective-toxicity: harmful to the pathogen but not to the host.
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Scientists & contributions to antimicrobials:
- John Mueller & Jane Hinton: developed Mueller-Hinton agar.
- Alexander Flemming: discovered penicillin in 1928.
- Dorothy Hodgkin: analyzed the chemical structures of natural products, allowing modification for new semisynthetic antimicrobials.
- Selman Waksman: identified several antibiotics, including the first effective one (Streptomyces) against tuberculosis in 1950s.
- Paul Ehrlich: searched for a "magic bullet".
Major Types of Antimicrobials
- Beta-lactams: affect cell wall.
- Glycopeptides: affect cell wall.
- Bacitracin: affects cell wall.
- Fluoroquinolones: affect DNA synthesis.
- Rifamycins: affect RNA synthesis.
- Polymixins: affect plasma membrane.
- Lipopeptides: affect plasma membrane.
- 30S subunit: affect ribosomes.
- 50S subunit: affect ribosomes.
- Folic acid synthesis: affect metabolic pathways.
- Mycolic acid synthesis: affect metabolic pathways.
Modes of Action
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Plasma Membrane:
- Disrupts cell membranes leading to cell death.
- Polymyxin B & colistin
- Lipopeptide: daptomycin
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Cell Wall Synthesis:
- Beta-lactams: inhibit peptide cross-links in peptidoglycans.
- Penicillins, cephalosporins, monobactams, carbapenems
- Glycopeptides: vancomycin
- Inhibit other steps related to peptidoglycan synthesis
- Bacitracin
- Inhibits other steps related to peptidoglycan synthesis
- Beta-lactams: inhibit peptide cross-links in peptidoglycans.
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DNA Synthesis:
- Fluoroquinolones: ciprofloxacin, levofloxacin & moxifloxacin
- Inhibit DNA gyros.
- Fluoroquinolones: ciprofloxacin, levofloxacin & moxifloxacin
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RNA Synthesis:
- Rifamycins: rifampin
- Inhibits bacterial RNA polymerases, preventing transcription.
- Rifamycins: rifampin
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Ribosomes:
- 30S subunit: aminoglycosides & tetracyclines
- Aminoglycosides: cause mismatches between codons and anticodons, resulting in faulty proteins.
- Tetracyclines: prevent tRNA from associating with ribosomes.
- 50S subunit: macroslides, lincosamides, chloramphenicol, oxazolidinones.
- Interacts with 50S ribosomal subunit or prevents initiation of protein synthesis.
- 30S subunit: aminoglycosides & tetracyclines
Metabolic Pathways
- Folic Acid Synthesis: sulfamonamides, sulfones & trimethoprim
- Sulfamethoxazole: blocks the production of dihydrofolic acid, which is an important co-factor in folic acid metabolism
- Mycolic Acid Synthesis: Isoniazid
- Narrow spectrum interfering with mycolic acid synthesis
Antimicrobials against Eukaryotic Microorganisms
- Imizazoles (miconazole), Quinolines (mefloquine), Avermectins (ivermectin)
Antibiotic Resistance
- Persister cells: genetic characteristics allow survival.
- Superbug evolutions: resistant to many different antibiotics.
- Horizontal gene transfer: transfer of antibiotic resistance among bacteria.
- Evolution: selective pressure leading to resistance.
- Long-term concern: many antibiotics no longer effective due to resistance.
Mechanisms of Antibiotic Resistance
- Efflux pump: ejection of the antibiotic from the cell.
- Fluoroquinolones
- Aminoglycosides
- Tetracyclines
- Beta-lactams
- Macrolides
- Blocked Penetration: prevents drug from reaching target site.
- Target Modification: altering the target site of the drug
- Fluorqinolones
- Rifamycins
Module 20: Emerging Diseases
- Diseases that are new to humans or have seen an increase in cases.
- Examples of emerging diseases: SARS, Zika, and Covid-19
- Human impact on the environment influencing emerging diseases: deforestation, changing animal contact, stress on animals leading to increased susceptibility to disease.
Module 21: Symbiosis
- Mutualism: both species benefit.
- Commensalism: one species benefits, the other is unaffected.
- Amensalism: one species is harmed, the other is unaffected
- Neutralism: both species are unaffected
- Parasitism: one species benefits, the other is harmed
- Examples of symbiosis: mutualism (humans and some strains of E. Coli), commensalism (Bacterium Staphylococcus epidermidis and humans)
Module 22: Disease Characteristics
- Information on different disease classifications, prevalence, types of infections etc.
- Communicable disease: capable of spread from person to person, either direct or indirectly.
- Infectious disease: caused by a pathogen
- Contagious disease: spread from person to person, level of threat dependent on how the pathogen is transmitted.
- Noncommunicable disease: not spread from one person to another.
- Periods of diseases: incubation, prodromal, illness, decline, convalescence
- Prevalence based classifications of diseases: sporadic, endemic, epidemic, pandemic
Module 23: Types of Infections
- Localized vs systemic infection
- Bacteremia: bacteria in the blood
- Septicemia: bacteria growing and dividing in the blood
- Toxemia: bacterial toxins in the blood
- Viremia: viruses in the blood
Module 24: Disease Portals
- Localized infections: limit to specified body areas.
- Generalized or systemic infections: spreads throughout the body.
- Viral and bacterial adhesins
- Antigenic drift/shift
- Toxins: biological poisons.
- Endotoxins from the outer membrane of a gram negative bacteria.
- Exotoxins are protein molecules produced by many pathogenic bacteria.
Module 23 - Examples of Disease
- Bacterial Diseases: Tuberculosis, Streptococcal pharyngitis, Tetanus, Cholera, Lyme disease, Chlamydia
- Viral diseases: Influenza, AIDS, COVID-19, Measles, Chicken pox, Ebola
- Prion diseases: Creutzfeldt-Jakob, Mad Cow Disease, Kuru
- Protozoal diseases: Malaria, Giardiasis, Toxoplasmosis, Amoebiasis, African trypanosomiasis
- Algal diseases: Ciguatera
- Fungal diseases: Ringworm, Candidiasis, Histoplasmosis, Aspergillosis.
- Helminthic diseases: Ascariasis, Schistosomiasis, Hookworm, Enterobiasis, Filariasis
Module 25 & 26 - Exam Specific
- Disease classifications, causative agents and symptoms of each disease.
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Description
Test your knowledge on antibiotics and their mechanisms. This quiz covers key concepts like the differences between natural and semisynthetic antimicrobials, the spectrum of activity, and important tests like the Kirby-Bauer disk diffusion test. Prepare to dive into the world of selective toxicity and superinfections.