Microbiology Overview and Classification
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Questions and Answers

Which of the following structures is responsible for producing proteins that are then transported out of the cell?

  • Lysosomes
  • Rough Endoplasmic Reticulum (correct)
  • Golgi Apparatus
  • Mitochondria
  • What is the primary function of lysosomes in a cell?

  • Cell division
  • Waste breakdown (correct)
  • Energy production
  • Protein synthesis
  • Which of these is a type of cell that is responsible for engulfing and destroying bacteria?

  • B-cells
  • Neutrophils (correct)
  • T-cells
  • Plasma cells
  • What is the primary difference between nonspecific and specific defense mechanisms in the immune system?

    <p>Nonspecific mechanisms are present at birth, while specific mechanisms develop over time. (C)</p> Signup and view all the answers

    Which of the following is NOT a characteristic of inflammation?

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

    What is the primary function of T-cells in the immune system?

    <p>Recognizing and destroying specific antigens (A)</p> Signup and view all the answers

    What is the role of memory B-cells in the immune system?

    <p>Remembering specific antigens and mounting a faster immune response upon re-exposure (A)</p> Signup and view all the answers

    Which of the following is NOT a characteristic of viruses?

    <p>They are capable of independent replication outside of host cells (B)</p> Signup and view all the answers

    Which of the following statements about bacterial spores is TRUE?

    <p>Spores are highly resistant to heat, chemicals, and radiation (B)</p> Signup and view all the answers

    What is the role of the Golgi Apparatus in a cell?

    <p>Packaging and modifying proteins for transport and secretion (C)</p> Signup and view all the answers

    What is the primary role of normal flora in a healthy individual?

    <p>To compete with pathogens and prevent disease (C)</p> Signup and view all the answers

    Which mode of transmission involves respiratory droplets traveling less than one meter?

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

    Which of the following is an example of indirect contact transmission?

    <p>Touching a contaminated handkerchief (C)</p> Signup and view all the answers

    Which type of transmission is characterized by the movement of pathogens through arthropods?

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

    What is a characteristic of transient flora?

    <p>They remain for an extended period before disappearing (A)</p> Signup and view all the answers

    Which of the following microorganisms are considered prokaryotic and lack a true nucleus?

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

    What is the primary characteristic that distinguishes viruses from all other microorganisms?

    <p>They lack a cellular structure (B)</p> Signup and view all the answers

    Which of the following is a correct statement regarding the life cycle of bacteria?

    <p>Spores are a dormant form of bacteria that can survive harsh conditions and later germinate to form vegetative cells. (C)</p> Signup and view all the answers

    What is the primary difference between Archaea and Bacteria?

    <p>Archaea are typically found in extreme environments, while bacteria are not. (C)</p> Signup and view all the answers

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

    <p>DNA is located in a nucleoid region (C)</p> Signup and view all the answers

    Which of the following organisms is known to be a plant pathogen lacking a protein coat?

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

    Which of the following is an example of a metabolically active form of bacteria?

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

    Which of the following is a characteristic of prions that differentiates them from viruses?

    <p>Prions lack nucleic acids (DNA or RNA), while viruses contain nucleic acids. (B)</p> Signup and view all the answers

    Signup and view all the answers

    Flashcards

    Transient Flora

    Microorganisms that temporarily inhabit the body, lasting hours to months.

    Opportunistic Pathogens

    Normal flora that cause disease when balance is disrupted.

    Contact Transmission

    Pathogen transfer through direct contact between hosts or via fomite.

    Vector Transmission

    Pathogen spread through animals, especially insects like mosquitoes.

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    Airborne Transmission

    Infectious agents traveling through the air for more than 1 meter.

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    Microbiology

    The study of organisms too small to be seen without magnification.

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    Microorganisms

    Tiny living organisms like bacteria, viruses, and fungi.

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    Prokaryotes

    Unicellular organisms with no nucleus, like bacteria.

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    Eukaryotes

    Organisms with a mature nucleus, includes algae and fungi.

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    Sporulation

    Process by which some bacteria form resistant spores.

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    Taxonomy

    The formal classification and naming system for living organisms.

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    Prions

    Infectious proteins that can cause diseases, lack nucleic acids.

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    Bioremediation

    Using microbes to clean up polluted environments.

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    Germination

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

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    Mitochondria

    Organelles that produce ATP, the energy currency of the cell.

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    Ribosomes

    Small RNA structures for protein synthesis, found free or on ER.

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    Endoplasmic Reticulum (ER)

    Network for lipid and protein synthesis, exists in smooth and rough forms.

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    Golgi Apparatus

    Flat sacs that package and ship proteins and lipids within the cell.

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    Lysosomes

    Organelles containing digestive enzymes to break down waste and pathogens.

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    Phagocytosis

    The process where cells engulf and digest particles or pathogens.

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    Inflammation

    Body's nonspecific response to injury, marked by swelling, redness, and pain.

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    Cell-mediated Immunity

    Immune response primarily involving T-cells against viruses and fungi.

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    Antibody-mediated Immunity

    Immune response involving B-cells and the production of antibodies against bacteria.

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    Study Notes

    Microbiology

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

    Cellular

    • Prokaryotes: Lack a true nucleus (pro=before, karyon=nucleus)
      • Archaea, bacteria, blue-green algae
    • Eukaryotes: With a true nucleus
      • Algae (excluding blue-green), fungi, protozoans

    Non-Cellular

    • Viruses, viroids, prions

    Taxonomy

    • Formal system for organizing, classifying, and naming living organisms

    • Bacteria: Prokaryotic, unicellular organisms

    • Archaea: Prokaryotic, unicellular organisms living in extreme environments

    • Algae: Eukaryotic organisms, unicellular or multicellular

    • Fungi: Eukaryotic organisms, unicellular or multicellular

    • Protozoa: Eukaryotic, unicellular or multicellular organisms

    • Viruses: Noncellular, seen only with electron microscopy; consist of NA surrounded by a protein coat

    Bacterial Life Cycle

    • Vegetative Form: Metabolically active, growing, multiplying; causes infection
    • Spore Form: Inert, resting, non-growing; highly resistant

    Cytoplasmic Organelles

    • Mitochondria: Power site, contains ATP
    • Ribosomes: Synthesize proteins
    • Endoplasmic Reticulum: Involved in lipid and protein synthesis
    • Golgi Apparatus: Packaging center
    • Lysosomes: Contain digestive enzymes
    • Centrioles: Involved in cell division
    • Cilia: Short, hair-like structures for movement
    • Flagella: Long, whip-like structures for movement
    • Chloroplasts: Convert sunlight to chemical energy (photosynthesis)

    Defense Mechanisms

    • Nonspecific: Act against all harmful agents; provides resistance
    • Specific: Act against certain agents; provides immunity; lacking resistance is called susceptibility
    • Virulence: degree of pathogenicity or disease-provoking power of a microbe

    Modes of Transmission

    • Contact: Direct (physical touch), Indirect (via fomites)
    • Droplet: Respiratory droplets (<1 meter)
    • Airborne: Respiratory droplets (>1 meter)
    • Water-borne/Food-borne: Contaminated water/food
    • Vector-borne: Animals carrying pathogens

    Applied Microbiology

    • Food production (yogurt, bread, wine, beer)
    • Water treatment
    • Pharmaceutical agents (penicillin)
    • Bioremediation
    • Forensics (medicine, crime)
    • Energy (ethanol, methane)

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    Microbiology PDF

    Description

    This quiz covers the essential concepts in microbiology, including the classification of microorganisms, their roles in ecosystems, and various branches of study in the field. Understand the differences between prokaryotic and eukaryotic organisms, as well as their significance in biotechnology and public health.

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