Microbiology Exam 4: Antibiotics
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Questions and Answers

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:

Miconazole = Fungal infections Mefloquine = Malaria treatment Ivermectin = Roundworm diseases Trimethoprim = Folic acid synthesis inhibition

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:

<p>Selective pressure = Easier to kill bacteria die first Superbugs = Susceptible to few antibiotics Long term concerns = Ineffectiveness of many antibiotics Development of new antibiotics = High cost to identify and test</p> Signup and view all the answers

Match the following drug classes with the specific type of microorganism they target:

<p>Sulfamonamides = Bacteria Avermectins = Helminths Quinolines = Protozoa Lincosamides = Bacteria</p> Signup and view all the answers

Match the medical terms with their definitions:

<p>-itis = inflammation -oma = tumor -pathy = disease -emia = of the blood</p> Signup and view all the answers

Match the types of noncommunicable diseases with their descriptions:

<p>Inherited = a genetic disease Congenital = disease present at or before birth Degenerative = progressive loss of function Nutritional deficiency = impaired function due to lack of nutrients</p> Signup and view all the answers

Match the periods of disease with their characteristics:

<p>Incubation period = no signs or symptoms Period of Illness = signs and symptoms are most severe Prodromal period = initial symptoms as immune system activates Period of decline = signs and symptoms begin to decrease</p> Signup and view all the answers

Match the types of diseases with their spread capabilities:

<p>Infectious disease = caused by a pathogen Communicable disease = spread from person to person Contagious disease = dependent on pathogen transmission Noncommunicable disease = not spread between people</p> Signup and view all the answers

Match the terms related to disease presentation:

<p>Signs = objective and measurable Symptoms = subjective and experienced by the patient Asymptomatic = no noticeable signs or symptoms Neoplastic = abnormal growth</p> Signup and view all the answers

Match the following types of disease prevalence with their definitions:

<p>Sporadic = Found at a low or expected frequency Endemic = Larger than normal number of cases in a short time Epidemic = Irregular intervals Pandemic = Spreads beyond a region and becomes widespread</p> Signup and view all the answers

Match the following types of infections with their characteristics:

<p>Acute = Infected person gets sick quickly Chronic = Typically develops slowly and can recur Latent = Dormant with no symptoms Localized = Limited area of the body affected</p> Signup and view all the answers

Match the following infection routes with their descriptions:

<p>Respiratory = Entry through breathing Gastrointestinal = Entry through ingestion Sexually transmitted = Entry through sexual contact Parenteral = Entry through cuts or breaks in the skin</p> Signup and view all the answers

Match the following terms related to infection severity with their definitions:

<p>Bacteremia = Presence of bacteria in the blood Septicemia = Bacteria growing and dividing in the blood Toxemia = Bacterial toxins in the blood Viremia = Viruses in the blood</p> Signup and view all the answers

Match the following bacterial diseases with their causative organisms:

<p>Tuberculosis = Mycobacterium tuberculosis Cholera = Vibrio cholerae Tetanus = Clostridium tetani Lyme disease = Borrelia burgdorferi</p> Signup and view all the answers

Match the following sources of disease with their examples:

<p>Humans = Primary infection in healthy individuals Animals = Source of zoonotic disease Nonliving = Environmental factors like water and soil Fomites = Surfaces that can carry disease</p> Signup and view all the answers

Match the following viral diseases with their causative agents:

<p>AIDS = Human Immunodeficiency Virus COVID-19 = SARS-CoV-2 Influenza = Orthomyxovirus Measles = Morbillivirus</p> Signup and view all the answers

Match the following bacterial diseases with their symptoms:

<p>Streptococcal pharyngitis = Throat pain and swollen lymph nodes Chlamydia = Pain or burning while peeing Tuberculosis = Cough with phlegm or blood Lyme disease = Red circular rash and fever</p> Signup and view all the answers

Match the following viral diseases with their symptoms:

<p>Chicken pox = Rash, fever, fatigue Ebola = Early fever and muscle pain COVID-19 = Fever or chills and cough Measles = Fever, cough, and rash</p> Signup and view all the answers

Match the following bacterial infections with their respective symptoms:

<p>Cholera = Diarrhea and dehydration Tetanus = Muscle spasms and stiffness Streptococcal pharyngitis = Fever Chlamydia = Abnormal discharge</p> Signup and view all the answers

Match the following antibiotics with their respective modes of action:

<p>Polymyxin = Plasma Membrane disruption Beta-lactams = Cell Wall synthesis Fluoroquinolones = DNA Synthesis inhibition Rifamycins = RNA Synthesis inhibition</p> Signup and view all the answers

Match the following scientists with their contributions to antimicrobial research:

<p>Alexander Flemming = Discovered penicillin in 1928 Dorothy Hodgkin = Analyzed chemical structures of natural products Selman Waksman = Identified antibiotics for tuberculosis Paul Ehrlich = Searched for the 'magic bullet'</p> Signup and view all the answers

Match the following antibiotics with their specific types:

<p>Daptomycin = Lipopeptide Vancomycin = Glycopeptide Ciprofloxacin = Fluoroquinolone Rifampin = Rifamycin</p> Signup and view all the answers

Match the following antimicrobial groups with their target structures:

<p>Bacitracin = Cell Wall Polymixins = Plasma Membrane Aminoglycosides = 30S ribosomal subunit Tetracyclines = 50S ribosomal subunit</p> Signup and view all the answers

Match the following modes of action to their description:

<p>Plasma Membrane disruption = Leads to cell death by disrupting outer membranes Cell Wall synthesis inhibition = Inhibits formation of peptide cross-links DNA Synthesis inhibition = Inhibits DNA gyrase for chromosome replication RNA Synthesis inhibition = Prevents transcription by inhibiting RNA polymerase</p> Signup and view all the answers

Match the following antimicrobial mechanisms to their functions:

<p>Folic Acid Synthesis = Metabolic pathway inhibition Mycolic Acid Synthesis = Inhibits lipid components in bacterial walls RNA Synthesis = Inhibits transcription processes DNA Synthesis = Prevents replication of genetic material</p> Signup and view all the answers

Match the following antibiotics with the specific bacterial activities they inhibit:

<p>Cephalosporins = Beta-lactam antibiotics Vancomycin = Inhibits peptidoglycan synthesis Ciprofloxacin = Inhibits DNA gyrase Tetracyclines = Prevents tRNA association with ribosomes</p> Signup and view all the answers

Match the following antimicrobial types with their respective examples:

<p>Aminoglycosides = Gentamicin Fluoroquinolones = Levofloxacin Glycopeptides = Teicoplanin Lipopeptides = Telavancin</p> Signup and view all the answers

Match the following diseases to their descriptions:

<p>MRSA = Antibiotic-resistant skin infection Uveitis = Inflammation of tissues surrounding the eye Ringworm = Fungal skin infection causing scaly patches Diphtheria = Respiratory disease with pseudomembrane formation</p> Signup and view all the answers

Match the following organisms to their disease:

<p>Mycoplasma pneumonia = Causes walking pneumonia Rhinovirus = Typical cause of the common cold Spirochaete = Causative agent of syphilis Listeria = Causes listeriosis, a food-borne infection</p> Signup and view all the answers

Match the following disease effects with their respective conditions:

<p>Syphilis = Stages include painless sore and rash Listeriosis = Dangerous for pregnant individuals Botulism = Food intoxication from low-acid foods Walking pneumonia = Similar presentation to common cold</p> Signup and view all the answers

Match the following diseases with their transmission modes:

<p>Diphtheria = Spread through respiratory droplets Syphilis = Sexually transmitted spirochaete infection Ringworm = Spread by skin-to-skin contact Listeriosis = Caused by contaminated food</p> Signup and view all the answers

Match these types of pneumonia with their causes:

<p>Walking pneumonia = Caused by Mycoplasma pneumonia Bacterial pneumonia = Can be caused by various bacteria Viral pneumonia = Commonly caused by influenza virus Aspiration pneumonia = Caused by inhalation of food or liquid</p> Signup and view all the answers

Match the following diseases to potential complications:

<p>Syphilis = May cause damage to the nervous system Uveitis = Can lead to permanent vision loss Listeriosis = Can result in infection of the baby Botulism = May lead to respiratory failure if severe</p> Signup and view all the answers

Match the following food-related diseases with their characteristics:

<p>Listeriosis = Food-borne infection that affects pregnant people Botulism = Caused by toxin in improperly canned food Salmonellosis = Caused by Salmonella bacteria from food E. coli infection = May come from undercooked meat or contaminated water</p> Signup and view all the answers

Study Notes

Microbiology Exam 4

  • Antibiotics

  • Magic Bullet: a chemical that targets a pathogen without harming the host.

  • Natural antibiotic: compounds made by microorganisms to kill or inhibit other microorganisms.

  • Semisynthetic antimicrobial: modified antimicrobials.

  • Spectrum: types of organisms affected by antimicrobials.

  • Narrow spectrum antimicrobial: affects only a few types of bacteria.

  • Broad spectrum antimicrobial: affects many types of bacteria (gram positive and gram negative).

  • Superinfection: Broad spectrum antibiotics kill nonresistant cells allowing drug resistant pathogens to proliferate, causing superinfection.

  • Bacteriostatic: inhibits the growth, but does not kill the organism.

  • Bactericidal: kills the target organism.

  • Kirby-Bauer disk diffusion test: measures the zone of inhibition to determine susceptibility to a drug.

  • Mueller-Hinton agar: media used for Kirby-Bauer test.

  • Selective-toxicity: harmful to the pathogen but not to the host.

  • 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

  • Plasma Membrane:
    • Disrupts cell membranes leading to cell death.
    • Polymyxin B & colistin
    • Lipopeptide: daptomycin
  • 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
  • DNA Synthesis:
    • Fluoroquinolones: ciprofloxacin, levofloxacin & moxifloxacin
      • Inhibit DNA gyros.
  • RNA Synthesis:
    • Rifamycins: rifampin
      • Inhibits bacterial RNA polymerases, preventing transcription.
  • 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.

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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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.

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