Microbiology Overview and Microorganism Classification
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Questions and Answers

Which of the following is NOT a characteristic of prokaryotic cells?

  • Lack a true nucleus
  • Have membrane-bound organelles (correct)
  • Are typically smaller than eukaryotic cells
  • Can be found in extreme environments
  • What is the term used to describe the process by which some bacteria form spores under unfavorable conditions?

  • Conjugation
  • Transduction
  • Sporulation (correct)
  • Binary fission
  • Which of the following organisms are classified as eukaryotes?

  • Bacteria and viruses
  • Prions and viroids
  • Archaea and fungi
  • Algae and protozoa (correct)
  • Which branch of microbiology focuses on the study of microorganisms involved in food production and preservation?

    <p>Food, dairy, and aquatic microbiology (B)</p> Signup and view all the answers

    Which of the following is an example of a non-cellular microorganism?

    <p>Viruses (C)</p> Signup and view all the answers

    What is the primary function of algae in the environment?

    <p>Photosynthesis (D)</p> Signup and view all the answers

    Which of the following is a characteristic shared by bacteria and archaea?

    <p>Prokaryotic cell structure (A)</p> Signup and view all the answers

    What is the primary difference between a virus and a viroid?

    <p>Viruses have a protein coat, while viroids do not (A)</p> Signup and view all the answers

    Which of the following is a common application of biotechnology in the field of microbiology?

    <p>Developing new vaccines (B)</p> Signup and view all the answers

    What is the term for the study of the immune system and its response to infectious agents?

    <p>Immunology (B)</p> Signup and view all the answers

    Which of the following is NOT an example of a fomite?

    <p>A mosquito (B)</p> Signup and view all the answers

    Which of the following is an example of a disease that is commonly transmitted through droplet transmission?

    <p>Measles (A)</p> Signup and view all the answers

    Which of the following is NOT a characteristic of normal flora?

    <p>They are always present in the body (C)</p> Signup and view all the answers

    Which of the following is an example of a disease that is commonly transmitted through bodily fluids?

    <p>HIV (A)</p> Signup and view all the answers

    Which of the following is an example of a disease that is commonly transmitted through water-borne or food-borne transmission?

    <p>Giardiasis (C)</p> Signup and view all the answers

    Which of the following is NOT an example of an application of applied microbiology?

    <p>Construction of buildings (D)</p> Signup and view all the answers

    Which of the following is an example of a biological vector?

    <p>A mosquito that transmits malaria (A)</p> Signup and view all the answers

    Which of the following is an example of a disease that is commonly transmitted through direct contact?

    <p>Measles (C)</p> Signup and view all the answers

    What is the main difference between droplet transmission and airborne transmission?

    <p>Droplet transmission involves larger droplets, while airborne transmission involves smaller droplets. (B)</p> Signup and view all the answers

    What is a potential benefit of having transient flora in the human body?

    <p>They can help to prevent the growth of harmful bacteria. (C)</p> Signup and view all the answers

    What is the primary function of the Golgi apparatus?

    <p>Package and ship cellular products (C)</p> Signup and view all the answers

    Which of the following is NOT a function of the complement system in nonspecific defense?

    <p>Directly kill bacteria (A)</p> Signup and view all the answers

    Which type of cell is responsible for producing antibodies?

    <p>Plasma cells (B)</p> Signup and view all the answers

    What is the main difference between nonspecific and specific defense mechanisms?

    <p>Nonspecific defenses are faster to activate than specific defenses. (A)</p> Signup and view all the answers

    Which of the following is NOT a sign or symptom of inflammation?

    <p>Decreased blood flow (C)</p> Signup and view all the answers

    What is the role of memory T-cells in cell-mediated immunity?

    <p>Recognize and respond more quickly to previously encountered antigens (B)</p> Signup and view all the answers

    Which of the following is a characteristic of a localized inflammatory response?

    <p>Confinement to a specific area (D)</p> Signup and view all the answers

    Which of the following is a type of phagocyte found in the liver?

    <p>Kupffer cells (A)</p> Signup and view all the answers

    What is the main function of cilia in the respiratory tract?

    <p>To trap and remove foreign particles (D)</p> Signup and view all the answers

    Which of the following is a characteristic of smooth endoplasmic reticulum?

    <p>It synthesizes lipids. (C)</p> Signup and view all the answers

    Flashcards

    Transient Flora

    Microorganisms that remain for a short time before disappearing, like Bacillus Laterosporus.

    Normal Flora

    Microorganisms that normally live in the body and protect against disease in healthy individuals.

    Opportunistic Pathogens

    Normal flora that can cause diseases if the body's balance is disturbed.

    Contact Transmission

    Spread of pathogens through direct or indirect physical contact.

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    Droplet Transmission

    Infectious agents spread via respiratory droplets over short distances (less than 1 meter).

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    Airborne Transmission

    Pathogens transmitted through air over distances greater than 1 meter.

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    Water-borne Transmission

    Spread of pathogens through untreated water or poorly prepared food.

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    Bodily Fluid Transmission

    Transmission of pathogens via blood, saliva, or other body fluids.

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    Vector Transmission

    Spread of pathogens via animals, particularly insects, either biologically or mechanically.

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    Applied Microbiology

    The use of microorganisms in various fields like food production, pharmaceuticals, and bioremediation.

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    Microbiology

    The study of organisms too small to see without magnification.

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    Microorganisms

    Organisms such as bacteria, viruses, fungi, protozoa, helminths, algae, and prions.

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    Bacteria

    Prokaryotic, unicellular organisms without a nucleus.

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    Archaea

    Prokaryotic, unicellular organisms that thrive in extreme environments.

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    Fungi

    Eukaryotic organisms that can be unicellular or multicellular.

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    Viruses

    Noncellular entities visible only by electron microscopy, made of nucleic acid and a protein coat.

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    Endospores

    Inert, resting forms of bacteria that can survive extreme conditions.

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    Taxonomy

    The formal system of organizing, classifying, and naming living organisms.

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    Biotechnology

    Use of microbes for production of foods, drugs, and vaccines.

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    Sporulation

    The process by which some bacteria form spores in unfavorable conditions.

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    Germination

    The process where spores change into vegetative form when conditions improve.

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    Mitochondria

    Organelles known as the power site, where ATP is produced.

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    Ribosomes

    Granules of RNA involved in protein synthesis, found free or attached to the ER.

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    Endoplasmic Reticulum (ER)

    Network of membranes, smooth for lipid synthesis, rough for protein synthesis.

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    Golgi Apparatus

    Flat sacs that package and ship proteins and lipids from the ER.

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    Phagocytosis

    The process by which cells (like neutrophils and macrophages) engulf pathogens.

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    Inflammation

    A nonspecific defense mechanism characterized by redness, heat, swelling, and pain.

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    T-cells

    Cells responsible for cell-mediated immunity, targeting viruses and fungi.

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    B-cells

    Cells that produce antibodies for antibody-mediated immunity, mainly against bacteria.

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    Study Notes

    Microbiology

    • Study of organisms too small to be seen without magnification
    • Originated with invention of the microscope
    • Microorganisms include bacteria, viruses, fungi, protozoa, helminths (worms), algae, and prions

    Branches of Study

    • Immunology
    • Public health microbiology and epidemiology
    • Food, dairy, and aquatic microbiology
    • Biotechnology
    • Genetic engineering and recombinant DNA technology
    • Manipulating genes

    Microbes' Roles

    • Nutrient production and energy flow
    • Decomposition
    • Biotechnology (food, drugs, vaccines)
    • Genetic engineering
    • Bioremediation
    • Infectious disease

    Classification of Microorganisms (Protists)

    I- Cellular

    • Prokaryotes: No nucleus or primitive nucleus (pro = before, early; karyon = nucleus)
      • Examples: Archaea, bacteria, blue-green algae
    • Eukaryotes: Mature nucleus
      • Examples: Algae (other than blue-green algae), fungi, protozoans

    II- Non-Cellular

    • Viruses, viroids, prions
    • Taxonomy: Formal system of organizing, classifying, and naming living organisms

    Types of Organisms

    • Bacteria: Prokaryotic, unicellular organisms
    • Archaea: Prokaryotic, unicellular organisms living in highly salty or extreme temperature environments
    • Algae: Eukaryotic organisms, performing photosynthesis
    • Fungi: Eukaryotic, unicellular or multicellular organisms
    • Protozoa: Eukaryotic, unicellular or multicellular organisms
    • Viruses: Noncellular, seen only by electron microscopy; consist of NA (nucleic acid) surrounded by a protein coat

    Bacterial Life Cycle

    • Vegetative Form: Metabolically active, growing, multiplying, causing infection
    • Spore Form: Inert, resting, non-growing, non-multiplying, highly resistant form; can live for years
    • Germination: Spore form changes into vegetative form when environmental conditions improve

    Cytoplasmic Organelles

    • Mitochondria: Long, fluid-filled sacs producing ATP
    • Ribosomes: Small granules of RNA, some free in cytoplasm, others attached to endoplasmic reticulum (ER); for protein synthesis
    • Endoplasmic Reticulum (ER):
      • Smooth ER: functions in lipid synthesis
      • Rough ER: functions in protein synthesis (for transport)
    • Golgi Apparatus: Flat sacs, connected to the ER, a shipping center
    • Lysosomes: Sacs containing digestive enzymes
    • Centrioles: Two rods at right angles, function in cell division
    • Cilia: Short, numerous, hair-like processes that move substances across a cell surface
    • Flagella: Long, few; move the cell
    • Chloroplasts: In algae and plant cells; convert sun energy into chemical energy via photosynthesis

    Defense Mechanisms Against Infection

    • Nonspecific Mechanisms: Act against all harmful agents, provide nonspecific resistance
    • Specific Mechanisms: Act against certain agents, provide specific resistance (immunity); lack of resistance is susceptibility; virulence is the degree of pathogenicity of a specific microbe

    Modes of Transmission

    • Contact: Direct (touching, kissing); Indirect (fomites)
    • Droplet: Infectious agents transmitted via respiratory droplets (travel less than 1 meter)
    • Airborne: Organisms travel more than a meter
    • Water-borne & Food-borne: Through untreated/poorly treated sewage and/or food
    • Vector: Animals, especially arthropods (biological or mechanical vectors)
    • Bodily Fluid: Blood, urine, saliva, other bodily fluids

    Applied Microbiology

    • Food production (yogurt, bread, alcoholic beverages)
    • Water treatment
    • Pharmaceutical agents (penicillin)
    • Agriculture (fertilizers)
    • Bioremediation (petroleum)
    • Forensics (medicine, bioterrorism)
    • Energy (ethanol, methane)

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    Description

    This quiz covers the fundamentals of microbiology, including the study of microorganisms and their classification. Explore the roles of microbes in nutrient production, decomposition, and biotechnology. Understand the differences between cellular and non-cellular organisms and their significance in various branches of study.

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